Unified Interior Regions

Region 9: Columbia-Pacific Northwest

Regions L2 Landing Page Tabs

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cableway sampling
December 12, 2012

Sampling from a cableway, Fall Creek, OR

USGS Hydrologic Technician Heather Bragg collects suspended-sediment sample from a cableway downstream from Fall Creek Reservoir. Reservoir was drawn down to purge sediment and trapped fish from behind dam in December 2012.

Video available online.

December 11, 2012

Suspended-Sediment Sampling from a Cableway

USGS Hydrologic Technician Heather Bragg collects suspended-sediment sample from a cableway downstream from Fall Creek Reservoir. Reservoir was drawn down to purge sediment and trapped fish from behind dam in December 2012.

December 11, 2012

Turbid Water in Fall Creek

Muddy, or turbid water, caused by suspended-sediment released during Fall Creek Reservoir draw down. Reservoir was drawn down to purge sediment and trapped fish from behind dam in December 2012.

Logs Floating in Spirit Lake, Mount St. Helens in the background....
November 27, 2012

Logs Floating in Spirit Lake, Mount St. Helens in the background.

Logs float in Spirit Lake near the Spirit Lake gaging station and outflow tunnel. View is to the south with Mount St. Helens in the background.

North Fork Toutle River Above the Sediment Retention Structure, Mou...
November 27, 2012

North Fork Toutle River, Sediment Retention Struct., Mount St. Helens

The May 18, 1980 eruption of Mount St. Helens had a dramatic impact on the North Fork Toutle River. The debris avalanche, lateral blast and ashfall produced a substantial amount of sediment, which continues to be washed into the river and transported downstream. A Sediment Retention Structure was constructed (out of view) to minimize the amount of sediment flowing

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August 25, 2012

L1 West Transect – 2012

Permanent Site: L1 West Transect; Depth: 11.2 Meters (36.6 Feet); Distance from river mouth: 2.3 Kilometers (1.4 Miles) west; Pre/Post Dam Removal: 10 months post-dam removal; Lat/Long: 48.13957527,-123.59427175; Site Description: This permanent site was only established post dam-removal after it was discovered that the degree of seaweed loss was more extensive than

August 25, 2012

L1 East Transect – 2012

Permanent Site: L1 East Transect; Depth: 11.0 Meters (36.2 Feet); Distance from river mouth: 2.3 Kilometers (1.4 Miles) west; Pre/Post Dam Removal: 10 months post-dam removal; Lat/Long: 48.13957527,-123.59359993; Site Description: This permanent site was only established post dam-removal after it was discovered that the degree of seaweed loss was more extensive than

August 24, 2012

K1 West Transect – 2012

Permanent Site: K1 West Transect; Depth: 6.1 Meters (19.9 Feet); Distance from river mouth: 4.5 Kilometers (2.8 Miles) east; Pre/Post Dam Removal: 10 months post-dam removal; Lat/Long: 48.13592923,-123.51082988; Site Description: This permanent transect was only established post dam-removal after it was discovered that the degree of seaweed loss was more extensive than

August 24, 2012

H2 West Transect – 2012

Permanent Site: H2 West Transect; Depth: 7.7 Meters (25.1 Feet); Distance from river mouth: 2.6 Kilometers (1.6 Miles) east; Pre/Post Dam Removal: 10 months 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 24, 2012

K1 East Transect – 2012

Permanent Site: K1 East Transect; Depth: 6.5 Meters (21.4 Feet); Distance from river mouth: 4.5 Kilometers (2.8 Miles) east; Pre/Post Dam Removal: 10 months post-dam removal; Lat/Long: 48.13592923,-123.5101581; Site Description: This permanent transect was only established post dam-removal after it was discovered that the degree of seaweed loss was more extensive than

Dendronotid nudibranch on hydroids
August 24, 2012

Dendronotid nudibranch on hydroids

Dendronotid nudibranch on hydroids - 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

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August 23, 2012

D2 East Transect – 2012

Permanent Site: D2 East Transect; Depth: 12.0 Meters (39.5 Feet); Distance from river mouth: 0.3 Kilometers (0.2 Miles); Pre/Post Dam Removal: 10 months post-dam removal; Lat/Long: 48.15233001,-123.56829403; Site Description: This site is right off the mouth of the river. Substrate is mainly gravel with some sand. Seaweeds are now mostly gone except for the perennial