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Craig D Snyder (Former Employee)

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Hydrological framework

A hydrological framework to improve precision of Vital Signs metrics in the Appalachian highlands

Stream flow is a fundamental driver of ecological structure and function, but its influence on bioassessment measures is poorly understood. Although extreme flow conditions (e.g., floods and droughts) have long been known to play a central role in structuring stream communities, a mechanistic understanding of the linkages between flow variables, landscape and local physical characteristics, and...
By
Ecosystems Mission Area, Species Management Research Program, Eastern Ecological Science Center
A hydrological framework to improve precision of Vital Signs metrics in the Appalachian highlands

A hydrological framework to improve precision of Vital Signs metrics in the Appalachian highlands

Stream flow is a fundamental driver of ecological structure and function, but its influence on bioassessment measures is poorly understood. Although extreme flow conditions (e.g., floods and droughts) have long been known to play a central role in structuring stream communities, a mechanistic understanding of the linkages between flow variables, landscape and local physical characteristics, and...
Learn More

Stream heat budget model input and scripts for simulating groundwater and thermal equilibrium controls on annual paired air-water temperature signal transport in headwater streams Stream heat budget model input and scripts for simulating groundwater and thermal equilibrium controls on annual paired air-water temperature signal transport in headwater streams

We investigated the relative importance of groundwater (GW) and other local heat budget processes on downstream annual stream temperature signal characteristics using deterministic heat budget model (HFLUX) scenarios within an idealized stream reach representative of mountainous forested conditions. The purpose of this data release is to provide additional supplemental information for a...
By
Washington Water Science Center

USGS EcoDrought Stream Discharge, Gage Height, and Water Temperature in Shenandoah National Park, Virginia USGS EcoDrought Stream Discharge, Gage Height, and Water Temperature in Shenandoah National Park, Virginia

The U.S. Geological Survey (USGS) Water Mission Area (WMA) - Ecosystems Mission Area (EMA) EcoDrought project is comprised of interdisciplinary teams in five pilot regions across the country. The over-arching project goal is to measure streamflow in headwater streams and to relate flow variation to stream fish population dynamics. For the catchments located in Shenandoah National Park...
By
Eastern Ecological Science Center, New England Water Science Center

USGS EcoDrought Stream Discharge, Gage Height and Water Temperature Data in Massachusetts (ver. 2.1, August 2025) USGS EcoDrought Stream Discharge, Gage Height and Water Temperature Data in Massachusetts (ver. 2.1, August 2025)

The USGS Water Mission Area (WMA) - Ecosystems Mission Area (EMA) EcoDrought project is comprised of interdisciplinary teams in five pilot regions across the country. The over-arching project goal is to measure streamflow in headwater streams and to relate flow variation to stream fish population dynamics. In the northeast, the New England Water Science Center (NewEngWSC) partnered with...
By
Eastern Ecological Science Center, New England Water Science Center

Stream temperature observations during summer 2021 for sites in the Sleepy Creek watershed, West Virginia Stream temperature observations during summer 2021 for sites in the Sleepy Creek watershed, West Virginia

This Data Release contains stream temperature observations for 10 sites in the Sleepy Creek Watershed (West Virginia) during summer 2021. Data were collected using Onset ProV2 temperature gages within perforated PVC cases attached to stream substrates with rebar. Temperature gages were deployed and retrieved by volunteers with the Sleepy Creek Watershed Association. Temperature records...
By
Eastern Ecological Science Center

Spatial patterns of dewatering within watersheds of Shenandoah National Park, Virginia 2016 - 2021 (ver. 2.0, December 2021) Spatial patterns of dewatering within watersheds of Shenandoah National Park, Virginia 2016 - 2021 (ver. 2.0, December 2021)

These data describe longitudinal (upstream to downstream) patterns of dewatering during summer baseflow (July-September) conditions in nine watersheds in Shenandoah National park. In July-August of 2016 all nine watersheds (Jeremy's Run, Hazel River, Piney River, Hughes River, Staunton River, Whiteoak Canyon Run, Paine Run, Meadow Run, and Big Run) were evaluated for dewatering. In...
By
Eastern Ecological Science Center

Ambystomatid salamander population and breeding pond habitat data for the Delaware Water Gap National Recreation Area (2001 - 2003) Ambystomatid salamander population and breeding pond habitat data for the Delaware Water Gap National Recreation Area (2001 - 2003)

This database contains breeding pond use data (i.e., egg mass and larval abundance counts) of three ambystomatid salamander species (Spotted salamander, Jefferson salamander, and marbled salamander) collected from 200 individual aquatic habitats (ponds, wetlands, and impoundments) in the Delaware Water Gap National Recreation. Data were collected between the years 2001 and 2003. The...
By
Eastern Ecological Science Center
No results found.
Filter Total Items: 22

Taking heat (downstream): Simulating groundwater and thermal equilibrium controls on annual paired air–water temperature signal transport in headwater streams Taking heat (downstream): Simulating groundwater and thermal equilibrium controls on annual paired air–water temperature signal transport in headwater streams

Headwater stream temperature often exhibits spatial variation at the kilometer-scale, but the relative importance of the underlying hydrogeological processes and riverine perturbations remains poorly understood. In this study, we investigated the relative importance of groundwater (GW) and other processes on downstream annual stream temperature signal characteristics using deterministic...
Authors
Zachary Johnson, Martin A. Briggs, Craig D. Snyder, Brittany G. Johnson, Nathaniel P. Hitt
By
Water Resources Mission Area, Washington Water Science Center

Bedrock depth influences spatial patterns of summer baseflow, temperature and flow disconnection for mountainous headwater streams Bedrock depth influences spatial patterns of summer baseflow, temperature and flow disconnection for mountainous headwater streams

In mountain headwater streams, the quality and resilience of summer cold-water habitat is generally regulated by stream discharge, longitudinal stream channel connectivity and groundwater exchange. These critical hydrologic processes are thought to be influenced by the stream corridor bedrock contact depth (sediment thickness), a parameter often inferred from sparse hillslope borehole...
Authors
Martin A. Briggs, Phillip J. Goodling, Zachary Johnson, Karli M. Rogers, Nathaniel P. Hitt, Jennifer H. Fair, Craig D. Snyder
By
Ecosystems Mission Area, Water Resources Mission Area, Maryland-Delaware-D.C. Water Science Center, Chesapeake Bay Activities, Eastern Ecological Science Center, New England Water Science Center, Washington Water Science Center

Managing nonperennial headwater streams in temperate forests of the United States Managing nonperennial headwater streams in temperate forests of the United States

Forest management guidelines are designed to protect water quality from unintended effects of land use changes such as timber harvest, mining, or forest road construction. Although streams that periodically cease to flow (nonperennial) drain the majority of forested areas, these streams are not consistently included in forest management guidelines. This paper reviews management...
Authors
Stephanie K. Kampf, Kathleen Dwyer, Matthew P. Fairchild, Jason B. Dunham, Craig D. Snyder, Kristin L. Jaeger, Charles H. Luce, John C. Hammond, Codie Wilson, Margaret Zimmer, Marielle Sidell
By
Maryland-Delaware-D.C. Water Science Center

Heed the data gap: Guidelines for using incomplete datasets in annual stream temperature analyses Heed the data gap: Guidelines for using incomplete datasets in annual stream temperature analyses

Stream temperature data are useful for deciphering watershed processes important for aquatic ecosystems. Accurately extracting signal trends from stream temperature is essential for predicting responses of environmental and ecological indicators to change. Missing data periods are common for various reasons, and pose a challenge for scientists using temperature signal analysis to support...
Authors
Zachary C. Johnson, Brittany G. Johnson, Martin A. Briggs, Craig D. Snyder, Nathaniel P. Hitt, Warren Devine
By
Ecosystems Mission Area, Eastern Ecological Science Center

Assessment of Ambystomatid salamander populations and their breeding habitats in the Delaware Water Gap National Recreation Area Assessment of Ambystomatid salamander populations and their breeding habitats in the Delaware Water Gap National Recreation Area

This report presents abundance and occurrence data for three species of ambystomad salamanders (Ambystoma maculatum, A. jeffersonianum, and A. opacum) collected over a 3-year period (2000, 2001, and 2002) at 200 potentional breeding sies within the Delaware Water Gap National Recreation Area (DEWA). In addition, numerous measures of inpond, near-pond, and landscape attributes were...
Authors
Craig D. Snyder, John A. Young, James T. Julian, Tim L. King, Shanon E. Julian
By
Ecosystems Mission Area, Eastern Ecological Science Center

Comparison of underwater video with electrofishing and dive‐counts for stream fish abundance estimation Comparison of underwater video with electrofishing and dive‐counts for stream fish abundance estimation

Advances in video technology enable new strategies for stream fish research. We compared juvenile (age‐0) and adult (age 1+) Brook Trout Salvelinus fontinalis abundance estimates from underwater video with backpack electrofishing and dive‐count methods across a series of stream pools in Shenandoah National Park, Virginia (n = 41). Video methods estimated greater mean abundance of adult...
Authors
Nathaniel P. Hitt, Karli M. Rogers, Craig D. Snyder, C. Andrew Dolloff
By
Ecosystems Mission Area, Eastern Ecological Science Center, Chesapeake Bay Activities

Science and Products

Hydrological framework

A hydrological framework to improve precision of Vital Signs metrics in the Appalachian highlands

Stream flow is a fundamental driver of ecological structure and function, but its influence on bioassessment measures is poorly understood. Although extreme flow conditions (e.g., floods and droughts) have long been known to play a central role in structuring stream communities, a mechanistic understanding of the linkages between flow variables, landscape and local physical characteristics, and...
By
Ecosystems Mission Area, Species Management Research Program, Eastern Ecological Science Center
A hydrological framework to improve precision of Vital Signs metrics in the Appalachian highlands

A hydrological framework to improve precision of Vital Signs metrics in the Appalachian highlands

Stream flow is a fundamental driver of ecological structure and function, but its influence on bioassessment measures is poorly understood. Although extreme flow conditions (e.g., floods and droughts) have long been known to play a central role in structuring stream communities, a mechanistic understanding of the linkages between flow variables, landscape and local physical characteristics, and...
Learn More

Stream heat budget model input and scripts for simulating groundwater and thermal equilibrium controls on annual paired air-water temperature signal transport in headwater streams Stream heat budget model input and scripts for simulating groundwater and thermal equilibrium controls on annual paired air-water temperature signal transport in headwater streams

We investigated the relative importance of groundwater (GW) and other local heat budget processes on downstream annual stream temperature signal characteristics using deterministic heat budget model (HFLUX) scenarios within an idealized stream reach representative of mountainous forested conditions. The purpose of this data release is to provide additional supplemental information for a...
By
Washington Water Science Center

USGS EcoDrought Stream Discharge, Gage Height, and Water Temperature in Shenandoah National Park, Virginia USGS EcoDrought Stream Discharge, Gage Height, and Water Temperature in Shenandoah National Park, Virginia

The U.S. Geological Survey (USGS) Water Mission Area (WMA) - Ecosystems Mission Area (EMA) EcoDrought project is comprised of interdisciplinary teams in five pilot regions across the country. The over-arching project goal is to measure streamflow in headwater streams and to relate flow variation to stream fish population dynamics. For the catchments located in Shenandoah National Park...
By
Eastern Ecological Science Center, New England Water Science Center

USGS EcoDrought Stream Discharge, Gage Height and Water Temperature Data in Massachusetts (ver. 2.1, August 2025) USGS EcoDrought Stream Discharge, Gage Height and Water Temperature Data in Massachusetts (ver. 2.1, August 2025)

The USGS Water Mission Area (WMA) - Ecosystems Mission Area (EMA) EcoDrought project is comprised of interdisciplinary teams in five pilot regions across the country. The over-arching project goal is to measure streamflow in headwater streams and to relate flow variation to stream fish population dynamics. In the northeast, the New England Water Science Center (NewEngWSC) partnered with...
By
Eastern Ecological Science Center, New England Water Science Center

Stream temperature observations during summer 2021 for sites in the Sleepy Creek watershed, West Virginia Stream temperature observations during summer 2021 for sites in the Sleepy Creek watershed, West Virginia

This Data Release contains stream temperature observations for 10 sites in the Sleepy Creek Watershed (West Virginia) during summer 2021. Data were collected using Onset ProV2 temperature gages within perforated PVC cases attached to stream substrates with rebar. Temperature gages were deployed and retrieved by volunteers with the Sleepy Creek Watershed Association. Temperature records...
By
Eastern Ecological Science Center

Spatial patterns of dewatering within watersheds of Shenandoah National Park, Virginia 2016 - 2021 (ver. 2.0, December 2021) Spatial patterns of dewatering within watersheds of Shenandoah National Park, Virginia 2016 - 2021 (ver. 2.0, December 2021)

These data describe longitudinal (upstream to downstream) patterns of dewatering during summer baseflow (July-September) conditions in nine watersheds in Shenandoah National park. In July-August of 2016 all nine watersheds (Jeremy's Run, Hazel River, Piney River, Hughes River, Staunton River, Whiteoak Canyon Run, Paine Run, Meadow Run, and Big Run) were evaluated for dewatering. In...
By
Eastern Ecological Science Center

Ambystomatid salamander population and breeding pond habitat data for the Delaware Water Gap National Recreation Area (2001 - 2003) Ambystomatid salamander population and breeding pond habitat data for the Delaware Water Gap National Recreation Area (2001 - 2003)

This database contains breeding pond use data (i.e., egg mass and larval abundance counts) of three ambystomatid salamander species (Spotted salamander, Jefferson salamander, and marbled salamander) collected from 200 individual aquatic habitats (ponds, wetlands, and impoundments) in the Delaware Water Gap National Recreation. Data were collected between the years 2001 and 2003. The...
By
Eastern Ecological Science Center
No results found.
Filter Total Items: 22

Taking heat (downstream): Simulating groundwater and thermal equilibrium controls on annual paired air–water temperature signal transport in headwater streams Taking heat (downstream): Simulating groundwater and thermal equilibrium controls on annual paired air–water temperature signal transport in headwater streams

Headwater stream temperature often exhibits spatial variation at the kilometer-scale, but the relative importance of the underlying hydrogeological processes and riverine perturbations remains poorly understood. In this study, we investigated the relative importance of groundwater (GW) and other processes on downstream annual stream temperature signal characteristics using deterministic...
Authors
Zachary Johnson, Martin A. Briggs, Craig D. Snyder, Brittany G. Johnson, Nathaniel P. Hitt
By
Water Resources Mission Area, Washington Water Science Center

Bedrock depth influences spatial patterns of summer baseflow, temperature and flow disconnection for mountainous headwater streams Bedrock depth influences spatial patterns of summer baseflow, temperature and flow disconnection for mountainous headwater streams

In mountain headwater streams, the quality and resilience of summer cold-water habitat is generally regulated by stream discharge, longitudinal stream channel connectivity and groundwater exchange. These critical hydrologic processes are thought to be influenced by the stream corridor bedrock contact depth (sediment thickness), a parameter often inferred from sparse hillslope borehole...
Authors
Martin A. Briggs, Phillip J. Goodling, Zachary Johnson, Karli M. Rogers, Nathaniel P. Hitt, Jennifer H. Fair, Craig D. Snyder
By
Ecosystems Mission Area, Water Resources Mission Area, Maryland-Delaware-D.C. Water Science Center, Chesapeake Bay Activities, Eastern Ecological Science Center, New England Water Science Center, Washington Water Science Center

Managing nonperennial headwater streams in temperate forests of the United States Managing nonperennial headwater streams in temperate forests of the United States

Forest management guidelines are designed to protect water quality from unintended effects of land use changes such as timber harvest, mining, or forest road construction. Although streams that periodically cease to flow (nonperennial) drain the majority of forested areas, these streams are not consistently included in forest management guidelines. This paper reviews management...
Authors
Stephanie K. Kampf, Kathleen Dwyer, Matthew P. Fairchild, Jason B. Dunham, Craig D. Snyder, Kristin L. Jaeger, Charles H. Luce, John C. Hammond, Codie Wilson, Margaret Zimmer, Marielle Sidell
By
Maryland-Delaware-D.C. Water Science Center

Heed the data gap: Guidelines for using incomplete datasets in annual stream temperature analyses Heed the data gap: Guidelines for using incomplete datasets in annual stream temperature analyses

Stream temperature data are useful for deciphering watershed processes important for aquatic ecosystems. Accurately extracting signal trends from stream temperature is essential for predicting responses of environmental and ecological indicators to change. Missing data periods are common for various reasons, and pose a challenge for scientists using temperature signal analysis to support...
Authors
Zachary C. Johnson, Brittany G. Johnson, Martin A. Briggs, Craig D. Snyder, Nathaniel P. Hitt, Warren Devine
By
Ecosystems Mission Area, Eastern Ecological Science Center

Assessment of Ambystomatid salamander populations and their breeding habitats in the Delaware Water Gap National Recreation Area Assessment of Ambystomatid salamander populations and their breeding habitats in the Delaware Water Gap National Recreation Area

This report presents abundance and occurrence data for three species of ambystomad salamanders (Ambystoma maculatum, A. jeffersonianum, and A. opacum) collected over a 3-year period (2000, 2001, and 2002) at 200 potentional breeding sies within the Delaware Water Gap National Recreation Area (DEWA). In addition, numerous measures of inpond, near-pond, and landscape attributes were...
Authors
Craig D. Snyder, John A. Young, James T. Julian, Tim L. King, Shanon E. Julian
By
Ecosystems Mission Area, Eastern Ecological Science Center

Comparison of underwater video with electrofishing and dive‐counts for stream fish abundance estimation Comparison of underwater video with electrofishing and dive‐counts for stream fish abundance estimation

Advances in video technology enable new strategies for stream fish research. We compared juvenile (age‐0) and adult (age 1+) Brook Trout Salvelinus fontinalis abundance estimates from underwater video with backpack electrofishing and dive‐count methods across a series of stream pools in Shenandoah National Park, Virginia (n = 41). Video methods estimated greater mean abundance of adult...
Authors
Nathaniel P. Hitt, Karli M. Rogers, Craig D. Snyder, C. Andrew Dolloff
By
Ecosystems Mission Area, Eastern Ecological Science Center, Chesapeake Bay Activities
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