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Filter Total Items: 259
coastal vulnerability of sea-level rise map
Date Published: January 18, 2018
Status: Active

National Assessment of Coastal Vulnerability to Sea Level Rise

The original national coastal vulnerability index (CVI) assessment was motivated by expected accelerated sea-level rise (SLR) and the uncertainty in the response of the coastline to SLR. This research was conducted between 1999 and 2001, and is currently being updated using new data sources and methodology. This original study was part of the ...

Oblique aerial photograph looking to the southwest along the southern end of Cedar Island, Virginia
Date Published: January 18, 2018
Status: Active

Long-Term Coastal Change

Goals of this task include developing and improving coastal-change assessments and supporting long-term planning and decision making to ensure sustainable coastal economies, infrastructure, and ecosystems.

Water use: Water Science School
Date Published: January 1, 2018
Status: Active

Water use

The Issue: Comprehensive water-use data and analysis of water-use information are needed to quantify the stress on existing supplies and to better model and evaluate possible water-supply management options to supplement traditional water-supply approaches. Advances have been made in the ability to control, divert, and develop water, but little attention has been paid to...

Graphic of waves breaking at the ocean surface with lettering below it for the coastal storm modeling system.
Date Published: January 1, 2018
Status: Active

PS-CoSMoS FAQs

Puget Sound - Coastal Storm Modeling System (PS-CoSMoS) frequently asked questions

Glaciers and Snowpack Study Area
Date Published: December 21, 2017
Status: Active

Glaciers and Snowpack

Glaciers, snow, and ice sheets are important components of the Earth's water and climate. They respond to and indicate changes in climate, as well as exerting an influence on global and regional climate. They also have an effect on water resources, serving as natural reservoirs. Measuring changes in the size and volume of glaciers and snowpacks provides one direct way of knowing what kind of...

Groundwater Geochemical and Selected Volatile Organic Compound Data, Operable Unit 1, Naval Undersea Warfare Center Report Cover
Date Published: December 20, 2017
Status: Active

Navy Investigations and Technical Oversight

The U.S. Navy is conducting environmental work at various sites on Navy installations in Washington, Alaska, and other northwestern states under mandates of the CERCLA and RCRA environmental regulations. This work is generally performed by private firms under contract to the Navy, commonly focusing on small areas near specific waste-disposal or spill sites.

To assist the Navy with the...

Map of Yakima County
Date Published: December 20, 2017
Status: Active

Yakima Nitrates

The Issue: Links between nitrate application to the land surface and measured nitrate concentrations in groundwater or surface water are poorly understood in the Yakima River basin due to the variety of potential nitrate sources. Fertilizer-intensive irrigated agriculture has been prevalent in the basin for decades, and since 1994 the growth of dairy operations has resulted in numerous liquid-...

Contacts: Robert W Black
SR530 OSO Landslide Sediment Transport
Date Published: December 8, 2017
Status: Completed

SR 530 Slide

In the immediate aftermath of the SR530 Landslide, the USGS supported first responders and decision-makers as a key member of the collaborative effort to monitor the stability of the landslide deposit and the associated impoundment of the North Fork Stillaguamish River during rescue operations. With the initial disaster response now over, longer-term questions have arisen regarding the...

WERC technician deploying water level logger
Date Published: October 30, 2017
Status: Active

Ecological Stressors - Rocky Coastlines, Mangroves, Marshes, Droughts, and Storms

Coastal estuaries that contain marshes and mangroves are currently being reshaped by changing ocean and atmospheric conditions through prolong drought, sea-level rise and increased extreme storm events. Many projected increases in sea-level are expected to result in loss of tidal wetlands and their component species. In addition, changing sediment loads, extreme tide and storm events, and...

Contacts: Karen Thorne
WERC Marsh in China Camp
Date Published: October 30, 2017
Status: Active

Supporting Informed Responses to Sea-Level Rise

To facilitate communication and outreach of sea level rise research results and implications, Dr. Karen Thorne and members of USGS WERC are hosting in-person workshops along the Pacific coast at different sites in Washington, Oregon, and California.

Contacts: Karen Thorne
Scientist collecting contents of invertebrate trap in Nisqually River Delta
Date Published: October 30, 2017
Status: Active

Wetland Restoration in the San Francisco Bay Delta and Pacific Northwest

Estuaries and healthy coastal habitats are among the most productive ecosystems on Earth. They provide a variety of benefits, including habitat and food for fish and wildlife, flood and erosion protection, improved water quality, increased carbon sequestration, as well as beautiful scenery and opportunities for recreation.  Along the U.S. Pacific Coast, both the San Francisco Bay estuary and...

Image: Sea Otter Ready for a Nap
Date Published: October 30, 2017
Status: Active

Pacific Nearshore Project

Sea otters are crucial indicators of the health of our nearshore waters and coastal resources, from kelp forests to fisheries. What clues does the sea otter's decline hold for our knowledge of ecosystem and global change? WERC's sea otter team and U.S. and Canadian researchers have teamed together to investigate. 

Relevance to USGS Missions:

This research project has direct...

Filter Total Items: 145
USGS
January 1, 2016

This part of the data release presents topography data from the Elwha River delta collected in July 2016. Topography data were collected on foot with global navigation satellite system (GNSS) receivers mounted on backpacks.

USGS
January 1, 2016

This part of the data release presents bathymetry data from the Elwha River delta collected in July 2015 using two personal watercraft (PWCs). The PWCs were equipped with single-beam echosounders and survey-grade global navigation satellite systems (GNSS) receivers.

USGS
January 1, 2016

This part of the data release presents bathymetry data from the Elwha River delta collected in February 2016 using two personal watercraft (PWCs). The PWCs were equipped with single-beam echosounders and survey-grade global navigation satellite system (GNSS) receivers.

USGS
January 1, 2016

This part of the data release presents bathymetry data from the Elwha River delta collected in July 2016 using a kayak. The kayak was equipped with a single-beam echosounder and a survey-grade global navigation satellite system (GNSS) receiver.

USGS
January 1, 2016

This part of the data release presents bathymetry data from the Elwha River delta collected in February 2016 using a kayak. The kayak was equipped with a single-beam echosounder and a survey-grade global navigation satellite system (GNSS) receiver.

Large map at top shows the study area bathymetry, four smaller maps below show the detail at locations from larger map.
December 30, 2015

High-resolution swath bathymetry and backscatter were collected in the mouth of the Columbia River (MCR) as part of the Office of Naval Research (ONR) funded River and Inlet Dynamics Experiment in 2013. The goal of the U.S. Geological Survey’s component of the research was to evaluate the various hydrodynamic and sediment transport processes in the Columbia River estuary entrance using

USGS
January 1, 2015

This part of the USGS data release presents acoustic backscatter data for the Columbia River Mouth, Oregon and Washington. The acoustic backscatter data of the Columbia River Mouth, Oregon and Washington were collected by the U.S. Geological Survey (USGS). Mapping was completed in 2013, using a 234-kHz SEA SWATHPlus interferometric system. These data are not intended for navigational pu

Quagga mussels from Lake Mead, Nev.
January 1, 2015

Aquatic invasive species are often transported between water bodies on boats or boat trailers. Thus, contaminated boats and boat trailers are considered one of the primary vectors for introduction of invasive species into a new water body. This data set was compiled in response to a funding grant from the Bonneville Power Administration Technology Innovation group (Cooperative agreement #59

USGS
January 1, 2015

This part of the USGS data release presents bathymetry data for the Columbia River Mouth, Oregon and Washington. The bathymetry data of the Columbia River Mouth, Oregon and Washington were collected by the U.S. Geological Survey (USGS). Mapping was completed in 2013, using a 234-kHz SEA SWATHPlus interferometric system. These data are not intended for navigational purposes.

Quagga mussels from Lake Mead, Nev.
January 1, 2015

Aquatic invasive species are often transported between water bodies on boats or boat trailers. Thus, contaminated boats and boat trailers are considered one of the primary vectors for introduction of invasive species into a new water body. This data set was compiled in response to a funding grant from the Bonneville Power Administration Technology Innovation group (Cooperative agreement #59

Quagga mussels from Lake Mead, Nev.
January 1, 2015

Aquatic invasive species are often transported between water bodies on boats or boat trailers. Thus, contaminated boats and boat trailers are considered one of the primary vectors for introduction of invasive species into a new water body. This data set was compiled in response to a funding grant from the Bonneville Power Administration Technology Innovation group (Cooperative agreement #59

 Screen Shot of the Land Treatment Digital Library Home Page
November 23, 2013

The Land Treatment Digital Library (LTDL) was created by the USGS to catalog legacy land treatment information on Bureau of Land Management lands in the western United States. The LTDL can be used by federal managers and scientists for compiling information for data-calls, producing maps, generating reports, and conducting analyses at varying spatial and temporal scales.

Filter Total Items: 716
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Year Published: 2011

Marine Habitat Use by Anadromous Bull Trout from the Skagit River, Washington

Acoustic telemetry was used to describe fish positions and marine habitat use by tagged bull trout Salvelinus confluentus from the Skagit River, Washington. In March and April 2006, 20 fish were captured and tagged in the lower Skagit River, while 15 fish from the Swinomish Channel were tagged during May and June. Sixteen fish tagged in 2004 and...

Hayes, Michael C.; Rubin, Steve P.; Reisenbichler, Reginald; Goetz, Fred A.; Jeanes, Eric; McBride, Aundrea
Marine Habitat Use by Anadromous Bull Trout from the Skagit River, Washington; 2011; Article; Journal; Marine and Coastal Fisheries: Dynamics, Management, and Ecosystem Science; Hayes, Michael C.; Rubin, Steve P., Rubin; Reisenbichler, Reginald; Goetz, Fred A.; Jeanes, Eric; McBride, Aundrea

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Year Published: 2010

Assessing survival of Mid-Columbia River released juvenile salmonids at McNary Dam, Washington, 2008-09

Few studies have evaluated survival of juvenile salmon over long river reaches in the Columbia River and information regarding the survival of sockeye salmon at lower Columbia River dams is lacking. To address these information gaps, the U.S. Geological Survey was contracted by the U.S. Army Corps of Engineers to evaluate the possibility of using...

Evans, Scott D.; Walker, Christopher E.; Brewer, Scott J.; Adams, Noah S.
Assessing survival of Mid-Columbia River released juvenile salmonids at McNary Dam, Washington, 2008-09; 2010; OFR; 2010-1237; Evans, Scott D.; Walker, Christopher E.; Brewer, Scott J.; Adams, Noah S.

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Year Published: 2010

Otolith analysis of pre-restoration habitat use by Chinook salmon in the delta-flats and nearshore regions of the Nisqually River Estuary

The Nisqually Fall Chinook population is one of 27 salmon stocks in the Puget Sound (Washington) evolutionarily significant unit listed as threatened under the federal Endangered Species Act (ESA). Extensive restoration of the Nisqually River delta ecosystem is currently taking place to assist in recovery of the stock as juvenile Fall Chinook...

Lind-Null, Angie; Larsen, Kim
Otolith analysis of pre-restoration habitat use by Chinook salmon in the delta-flats and nearshore regions of the Nisqually River Estuary; 2010; OFR; 2010-1238; Lind-Null, Angie; Larsen, Kim

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Year Published: 2010

Approach, passage, and survival of juvenile salmonids at Little Goose Dam, Washington: Post-construction evaluation of a temporary spillway weir, 2009

This report describes a study of dam passage and survival of radio-tagged juvenile salmonids after installation of a temporary spillway weir (TSW) at Little Goose Dam, Washington, in 2009. The purpose of the study was to document fish passage and survival when the dam was operated with the TSW in place. Spillway weirs are one of several methods...

Beeman, J.W.; Braatz, A.C.; Hansel, H.C.; Fielding, S.D.; Haner, P.V.; Hansen, G.S.; Shurtleff, D.J.; Sprando, J.M.; Rondorf, D.W.
Approach, passage, and survival of juvenile salmonids at Little Goose Dam, Washington: Post-construction evaluation of a temporary spillway weir, 2009; 2010; OFR; 2010-1224; Beeman, J. W.; Braatz, A. C.; Hansel, H. C.; Fielding, S. D.; Haner, P. V.; Hansen, G. S.; Shurtleff, D. J.; Sprando, J. M.; Rondorf, D. W.

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Year Published: 2010

Approach, passage, and survival of juvenile salmonids at Little Goose Dam, Washington: Post-construction evaluation of a temporary spillway weir, 2009

This report describes a study of dam passage and survival of radio-tagged juvenile salmonids after installation of a temporary spillway weir (TSW) at Little Goose Dam, Washington, in 2009. The purpose of the study was to document fish passage and survival when the dam was operated with the TSW in place. Spillway weirs are one of several methods...

Beeman, John W.; Braatz, Amy C.; Hansel, Hal C.; Fielding, Scott D.; Haner, Philip V.; Hansen, Gabriel S.; Shurtleff, Dana J.; Sprando, Jamie M.; Rondorf, Dennis W.
Approach, passage, and survival of juvenile salmonids at Little Goose Dam, Washington: Post-construction evaluation of a temporary spillway weir, 2009; 2010; SIR; 2010-1224; Beeman, John W.; Braatz, Amy C.; Hansel, Hal C.; Fielding, Scott D.; Haner, Philip V.; Hansen, Gabriel S.; Shurtleff, Dana J.; Sprando, Jamie M.; Rondorf, Dennis W.

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Year Published: 2010

Snake River Fall Chinook Salmon life history investigations annual report, 2009

In 2009, we used radio and acoustic telemetry to evaluate the migratory behavior, survival, mortality, and delay of subyearling fall Chinook salmon in the Clearwater River and Lower Granite Reservoir. We released a total of 1,000 tagged hatchery subyearlings at Cherry Lane on the Clearwater River in mid August and we monitored them as they passed...

Tiffan, Kenneth F.; Connor, William P.; Buchanan, Rebecca A.; Bellgraph, Brian J.

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Year Published: 2010

Snake River fall Chinook salmon life history investigations, annual report 2008

In 2009, we used radio and acoustic telemetry to evaluate the migratory behavior, survival, mortality, and delay of subyearling fall Chinook salmon in the Clearwater River and Lower Granite Reservoir. We released a total of 1,000 tagged hatchery subyearlings at Cherry Lane on the Clearwater River in mid August and we monitored them as they passed...

Tiffan, Kenneth F.; Connor, William P.; Bellgraph, Brian J.; Buchanan, Rebecca A.

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Year Published: 2010

Characterization of the contents and histology of the gastrointestinal tracts of White Sturgeon (Acipenser transmontanus) captured from Upper Lake Roosevelt, Washington, October 2008

The gastrointestinal tracts of 37 juvenile white sturgeon (Acipenser transmontanus) captured from the upper part of Lake Roosevelt during October 2008, were examined to identify prey taxa and to determine if the fish were consuming smelter slag along with other sediments. Histological examination of the gastrointestinal tract tissues and...

Parsley, Michael J.; van der Leeuw, Bjorn K.; Elliott, Diane G.
Characterization of the contents and histology of the gastrointestinal tracts of White Sturgeon (Acipenser transmontanus) captured from Upper Lake Roosevelt, Washington, October 2008; 2010; OFR; 2010-1193; Parsley, Michael J.; van der Leeuw, Bjorn K.; Elliott, Diane G.

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Year Published: 2010

Water use trends in Washington, 1985-2005

Since 1950, the U.S. Geological Survey Washington Water Science Center (USGS-WAWSC) has collected, compiled, and published, at 5-year intervals, statewide estimates of the amounts of water withdrawn and used for various purposes in Washington State. As new data and methods became available, some of the original datasets were recompiled. The most...

Lane, R.C.
Water use trends in Washington, 1985-2005; 2010; FS; 2010-3057; Lane, R. C.

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Year Published: 2010

Hydraulic alterations resulting from hydropower development in the Bonneville Reach of the Columbia River

We used a two-dimensional (2D) hydrodynamic model to simulate and compare the hydraulic characteristics in a 74-km reach of the Columbia River (the Bonneville Reach) before and after construction of Bonneville Dam. For hydrodynamic modeling, we created a bathymetric layer of the Bonneville Reach from single-beam and multi-beam echo-sounder surveys...

Hatten, James R.; Batt, Thomas R.

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Year Published: 2010

Sediment management strategies associated with dam removal in the State of Washington

Different removal strategies are described for dams in three diverse drainage basins (Wind River, White Salmon River, and Elwha River basins) in the State of Washington (USA). The comparisons between the strategies offer the opportunity to track the effects of sediment resulting from dam decommissioning in the Pacific Northwest and to determine...

Magirl, C.S.; Connolly, P.J.; Coffin, B.; Duda, J.J.; Draut, A.E.

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Year Published: 2010

Volcano collapse promoted by progressive strength reduction: New data from Mount St. Helens

Rock shear strength plays a fundamental role in volcano flank collapse, yet pertinent data from modern collapse surfaces are rare. Using samples collected from the inferred failure surface of the massive 1980 collapse of Mount St. Helens (MSH), we determined rock shear strength via laboratory tests designed to mimic conditions in the pre-collapse...

Reid, Mark E.; Keith, Terry E.C.; Kayen, Robert E.; Iverson, Neal R.; Iverson, Richard M.; Brien, Dianne

Filter Total Items: 856
August 11, 2016

C2 West Transect – 2016

Permanent Site: C2 West Transect; Depth: 16.5 Meters (54.2 Feet); Distance from river mouth: 0.7 Kilometers (0.5 Miles); Pre/Post Dam Removal: 5 years post-dam removal; Lat/Long: 48.147841,-123.57663268; Site Description: One of our deepest sites. Substrate is all muddy sand. Seaweed is absent. Woody debris is present (1:18 seconds). The featherduster tubeworms that were

...
English Sole
August 11, 2016

English Sole

English Sole - Scuba divers from the U.S. Geological Survey’s Western Fisheries Research Center, Washington Sea Grant, EPA and the Lower Elwha Klallam Tribe collected data and images from a long-term study of the Elwha River dam removals and the resulting effects on the nearshore ecosystem.

Location: Strait of Juan de Fuca, near the

...
August 11, 2016

H1 East Transect – 2016

Permanent Site: H1 East Transect; Depth: 5.7 Meters (18.8 Feet); Distance from river mouth: 2.4 Kilometers (1.5 Miles) east; Pre/Post Dam Removal: 5 years post-dam removal; Lat/Long: 48.1479177,-123.53472865; Site Description: This is a shallow site and one of the farthest removed from the effects of the sediment plume outside of the control sites. Substrate is still

...
August 11, 2016

A2 West Transect – 2016

Permanent Site: A2 West Transect; Depth: 13.2 Meters (43.2 Feet); Distance from river mouth: Kilometers 1.8 (1.1 Miles); Pre/Post Dam Removal: 5 years post-dam removal; Lat/Long: 48.14130295, -123.5883331; Site Description: One of our deeper sites at over 40 feet. Sediment is primarily sand/sandy mud with scattered boulders. Seaweeds are still sparse and mainly acid kelp

...
August 10, 2016

L1 West Transect – 2016

Permanent Site: L1 West Transect; Depth: 11.1 Meters (36.5 Feet); Distance from river mouth: 2.3 Kilometers (1.4 Miles) west; Pre/Post Dam Removal: 5 years post-dam removal; Lat/Long: 48.13957527,-123.59427175; Site Description: This transect is medium depth. The first 20 meters contains scattered boulders (0:17 seconds). Where there are no boulders, substrate is mainly

...
August 10, 2016

H2 West Transect – 2016

Permanent Site: H2 West Transect; Depth: 7.8 Meters (25.5 Feet); Distance from river mouth: 2.6 Kilometers (1.6 Miles) east; Pre/Post Dam Removal: 5 years post-dam removal; Lat/Long: 48.15008216,-123.53277857; Site Description: This site is medium to shallow depth. Substrate is mainly gravel with some sand, cobble and an occasional boulder and has not changed since dam

...
August 10, 2016

C2 East Transect – 2016

Permanent Site: C2 East Transect; Depth: 16.1 Meters (52.8 Feet); Distance from river mouth: 0.7 Kilometers (0.4 Miles); Pre/Post Dam Removal: 5 years post-dam removal; Lat/Long: 48.147841,-123.57596074; Site Description: One of our deepest sites. Substrate is all muddy sand. Seaweed is absent. A very large pile of woody debris lying in an indentation in the sand is seen

...
August 9, 2016

H2 East Transect – 2016

Permanent Site: H2 East Transect; Depth: 8.1 Meters (26.6 Feet); Distance from river mouth: 2.6 Kilometers (1.6 Miles) east; Pre/Post Dam Removal: 5 years post-dam removal; Lat/Long: 48.15008216,-123.53210661; Site Description: This site is medium to shallow depth. Substrate is mainly gravel with some sand, cobble and an occasional boulder and has not changed since dam

...
August 9, 2016

A1 West Transect – 2016

Permanent Site: A1 West Transect; Depth: 9.0 Meters (29.6 Feet); Distance from river mouth: 1.9 Kilometers (1.2 Miles) West; Pre/Post Dam Removal: 5 years post-dam removal; Lat/Long: 48.13870775, -123.586203; Site Description: Transect is in eastern part of Freshwater Bay. Sediment is primarily sand/sandy mud with patches of boulders. Seaweeds are common this year. Most

...
August 8, 2016

C1 East Transect – 2016

Permanent Site: C1 East Transect; Depth: Meters (Feet); Distance from river mouth: 0.7 Kilometers (0.4 Miles); Pre/Post Dam Removal: 5 years post-dam removal; Lat/Long: 48.14525225,-123.57294101; Site Description: Substrate is entirely sand. All seaweeds are absent. Woody debris is present (0:26, seconds). Invertebrates are scarce and are almost exclusively the ornate

...
August 8, 2016

C1 West Transect – 2016

Permanent Site: C1 West Transect; Depth: Meters (Feet); Distance from river mouth: 0.7 Kilometers (0.4 Miles); Pre/Post Dam Removal: 5 years post-dam removal; Lat/Long: 48.14525225,-123.57361291; Site Description: Substrate is entirely sand. All seaweeds are absent. Woody debris is present (0:12, 1:49 seconds). Invertebrates are scarce and are almost exclusively the ornate

...
August 8, 2016

4SP1 East Transect – 2016

Permanent Site: 4SP1 - East Transect; Depth: 5.2 Meters (17.0 Feet); Distance from river mouth: 0.8 Kilometers (0.5 Miles) East; Pre/Post Dam Removal: 4 years post-dam removal; Lat/Long: 48.15257, -123.556704; Site Description: The site has converted from gravel/cobble substrate to all sand. Seaweed is completely absent. 
 

Filter Total Items: 368
Image: Oso, Washington Landslide
January 12, 2015

VANCOUVER, Wash. — The large landslide that occurred on March 22, 2014 near Oso, Washington was unusually mobile and destructive.

Image: Steve Hickman Earthquake Science Center Director
January 12, 2015

The U.S. Geological Survey is pleased to announce the selection of Dr. Stephen Hickman to serve as the new director of the USGS Earthquake Science Center, headquartered in Menlo Park, California.

collage of scientists conducting science related to each mission are
January 5, 2015

CORVALLIS, Ore. — Scientists from the U.S. Geological Survey and Washington State University have discovered that endangered Chinook salmon can be detected accurately from DNA they release into the environment. The results are part of a special issue of the journal Biological Conservation on use of environmental DNA to inform conservation and management of aquatic species.

Issue2.12December2014Thumb
January 5, 2015

WFRC’s Bacterial Kidney Disease Research and Its Relation to the Great Lakes Fisheries

USGS
December 18, 2014

Secretary of the Interior Sally Jewell announced today that Interior’s Northwest Climate Science Center is awarding more than one million dollars to universities and other partners for research to guide managers of parks, refuges and other cultural and natural resources in planning how to help species and ecosystems adapt to climate change.

collage of scientists conducting science related to each mission are
December 17, 2014

WASHINGTON, Dec. 17, 2014 — The United States Department of Agriculture's (USDA) Animal and Plant Health Inspection Service (APHIS) confirmed the presence of highly pathogenic (HPAI) H5 avian influenza in wild birds in Whatcom County, Washington.

Historical photo of a flood on Willamette River in Oregon from 1964
December 11, 2014

The Christmas flood of 1964 encompassed about 200,000 square miles, or roughly the size of France, resulted in 47 deaths, left thousands homeless and caused more than $540 million ($3.9 billion today) worth of damage.

Issue2.11November2014Thumb
December 1, 2014

Noted Scientist Emeritus Dr. Wm. Toshio Yasutake Retires - Again!

Issue2.10October2014Thumb
November 12, 2014

Supporting Restoration with Research in the Nisqually River Delta

USGS
November 3, 2014

Such sequences are often seen during the winter months at Mount Rainier, and researchers have shown that their occurrence correlates strongly with storms that drop heavy snow on the mountain.

USGS
October 1, 2014

Scientists from the U.S. Geological Survey will use a harmless fluorescent red dye to determine the complexity of the channel in the Elwha River as part of a larger effort to define conditions in the river since the removal of two dams.

Filter Total Items: 160