Heather M Bragg
Heather Bragg is a hydrologic technician at the USGS Oregon Water Science Center.
Science and Products
Filter Total Items: 32
Total dissolved gas and water temperature in the lower Columbia River, Oregon and Washington, water year 2013: quality-assurance data and comparison to water-quality standards Total dissolved gas and water temperature in the lower Columbia River, Oregon and Washington, water year 2013: quality-assurance data and comparison to water-quality standards
Significant Findings An analysis of total-dissolved-gas (TDG) and water-temperature data collected at eight fixed monitoring stations on the lower Columbia River in Oregon and Washington in water year 2013 indicated the following: During the spill season of April–August 2013, the averages of the 12 highest hourly TDG values in a day were periodically greater than 115-percent saturation...
Authors
Heather M. Bragg, Matthew W. Johnston
Assessment of suspended-sediment transport, bedload, and dissolved oxygen during a short-term drawdown of Fall Creek Lake, Oregon, winter 2012-13 Assessment of suspended-sediment transport, bedload, and dissolved oxygen during a short-term drawdown of Fall Creek Lake, Oregon, winter 2012-13
The drawdown of Fall Creek Lake resulted in the net transport of approximately 50,300 tons of sediment from the lake during a 6-day drawdown operation, based on computed daily values of suspended-sediment load downstream of Fall Creek Dam and the two main tributaries to Fall Creek Lake. A suspended-sediment budget calculated for 72 days of the study period indicates that as a result of...
Authors
Liam N. Schenk, Heather M. Bragg
Total dissolved gas and water temperature in the lower Columbia River, Oregon and Washington, water year 2012: Quality-assurance data and comparison to water-quality standards Total dissolved gas and water temperature in the lower Columbia River, Oregon and Washington, water year 2012: Quality-assurance data and comparison to water-quality standards
Significant Findings Air is entrained in water as it is flows through the spillways of dams, which causes an increase in the concentration of total dissolved gas in the water downstream from the dams. The elevated concentrations of total dissolved gas can adversely affect fish and other freshwater aquatic life. An analysis of total-dissolved-gas and water-temperature data collected at...
Authors
Dwight Q. Tanner, Heather M. Bragg, Matthew W. Johnston
Suspended-sediment characteristics for the Johnson Creek basin, Oregon, water years 2007-10 Suspended-sediment characteristics for the Johnson Creek basin, Oregon, water years 2007-10
Significant Findings An analysis of suspended-sediment transport in the Johnson Creek basin, Oregon, during water years 2007–10 indicated that: Streamflow characteristics for the 4 years of study were not extremely dry or wet, and represented near-average conditions. Computed average annual suspended-sediment loads were 1,890 and 4,640 tons at the Gresham and Milwaukie stations...
Authors
Adam J. Stonewall, Heather M. Bragg
Geomorphic response of the Sandy River, Oregon, to removal of Marmot Dam Geomorphic response of the Sandy River, Oregon, to removal of Marmot Dam
The October 2007 breaching of a temporary cofferdam constructed during removal of the 15-meter (m)-tall Marmot Dam on the Sandy River, Oregon, triggered a rapid sequence of fluvial responses as ~730,000 cubic meters (m3) of sand and gravel filling the former reservoir became available to a high-gradient river. Using direct measurements of sediment transport, photogrammetry, airborne...
Authors
Jon J. Major, Jim E. O'Connor, Charles J. Podolak, Mackenzie K. Keith, Gordon E. Grant, Kurt R. Spicer, Smokey Pittman, Heather M. Bragg, J. Rose Wallick, Dwight Q. Tanner, Abagail Rhode, Peter R. Wilcock
Total dissolved gas and water temperature in the lower Columbia River, Oregon and Washington, water year 2011: Quality-assurance data and comparison to water-quality standards Total dissolved gas and water temperature in the lower Columbia River, Oregon and Washington, water year 2011: Quality-assurance data and comparison to water-quality standards
Significant Findings Air is entrained in water as it is flows through the spillways of dams, which causes an increase in the concentration of total dissolved gas in the water downstream from the dams. The elevated concentrations of total dissolved gas can adversely affect fish and other freshwater aquatic life. An analysis of total-dissolved-gas and water-temperature data collected at...
Authors
Dwight Q. Tanner, Heather M. Bragg, Matthew W. Johnston
Science and Products
Filter Total Items: 32
Total dissolved gas and water temperature in the lower Columbia River, Oregon and Washington, water year 2013: quality-assurance data and comparison to water-quality standards Total dissolved gas and water temperature in the lower Columbia River, Oregon and Washington, water year 2013: quality-assurance data and comparison to water-quality standards
Significant Findings An analysis of total-dissolved-gas (TDG) and water-temperature data collected at eight fixed monitoring stations on the lower Columbia River in Oregon and Washington in water year 2013 indicated the following: During the spill season of April–August 2013, the averages of the 12 highest hourly TDG values in a day were periodically greater than 115-percent saturation...
Authors
Heather M. Bragg, Matthew W. Johnston
Assessment of suspended-sediment transport, bedload, and dissolved oxygen during a short-term drawdown of Fall Creek Lake, Oregon, winter 2012-13 Assessment of suspended-sediment transport, bedload, and dissolved oxygen during a short-term drawdown of Fall Creek Lake, Oregon, winter 2012-13
The drawdown of Fall Creek Lake resulted in the net transport of approximately 50,300 tons of sediment from the lake during a 6-day drawdown operation, based on computed daily values of suspended-sediment load downstream of Fall Creek Dam and the two main tributaries to Fall Creek Lake. A suspended-sediment budget calculated for 72 days of the study period indicates that as a result of...
Authors
Liam N. Schenk, Heather M. Bragg
Total dissolved gas and water temperature in the lower Columbia River, Oregon and Washington, water year 2012: Quality-assurance data and comparison to water-quality standards Total dissolved gas and water temperature in the lower Columbia River, Oregon and Washington, water year 2012: Quality-assurance data and comparison to water-quality standards
Significant Findings Air is entrained in water as it is flows through the spillways of dams, which causes an increase in the concentration of total dissolved gas in the water downstream from the dams. The elevated concentrations of total dissolved gas can adversely affect fish and other freshwater aquatic life. An analysis of total-dissolved-gas and water-temperature data collected at...
Authors
Dwight Q. Tanner, Heather M. Bragg, Matthew W. Johnston
Suspended-sediment characteristics for the Johnson Creek basin, Oregon, water years 2007-10 Suspended-sediment characteristics for the Johnson Creek basin, Oregon, water years 2007-10
Significant Findings An analysis of suspended-sediment transport in the Johnson Creek basin, Oregon, during water years 2007–10 indicated that: Streamflow characteristics for the 4 years of study were not extremely dry or wet, and represented near-average conditions. Computed average annual suspended-sediment loads were 1,890 and 4,640 tons at the Gresham and Milwaukie stations...
Authors
Adam J. Stonewall, Heather M. Bragg
Geomorphic response of the Sandy River, Oregon, to removal of Marmot Dam Geomorphic response of the Sandy River, Oregon, to removal of Marmot Dam
The October 2007 breaching of a temporary cofferdam constructed during removal of the 15-meter (m)-tall Marmot Dam on the Sandy River, Oregon, triggered a rapid sequence of fluvial responses as ~730,000 cubic meters (m3) of sand and gravel filling the former reservoir became available to a high-gradient river. Using direct measurements of sediment transport, photogrammetry, airborne...
Authors
Jon J. Major, Jim E. O'Connor, Charles J. Podolak, Mackenzie K. Keith, Gordon E. Grant, Kurt R. Spicer, Smokey Pittman, Heather M. Bragg, J. Rose Wallick, Dwight Q. Tanner, Abagail Rhode, Peter R. Wilcock
Total dissolved gas and water temperature in the lower Columbia River, Oregon and Washington, water year 2011: Quality-assurance data and comparison to water-quality standards Total dissolved gas and water temperature in the lower Columbia River, Oregon and Washington, water year 2011: Quality-assurance data and comparison to water-quality standards
Significant Findings Air is entrained in water as it is flows through the spillways of dams, which causes an increase in the concentration of total dissolved gas in the water downstream from the dams. The elevated concentrations of total dissolved gas can adversely affect fish and other freshwater aquatic life. An analysis of total-dissolved-gas and water-temperature data collected at...
Authors
Dwight Q. Tanner, Heather M. Bragg, Matthew W. Johnston