DART Hourly Water Quality Metadata & Glossary

Hourly Water Quality Data Locations
Abbrev	Water Quality Monitor Name	River	Years of Coverage	Primary Data Source
ANQW	Anatone WA	Snake	1999-present	U.S. Army Corps of Engineers
BON	Bonneville Forebay	Columbia	1995-present	U.S. Army Corps of Engineers
CCIW	Cascade Island (below BON)	Columbia	2004-present	U.S. Army Corps of Engineers
CIBW	Boundary (US/Canada)	Columbia	1997-present	U.S. Army Corps of Engineers
CHJ	Chief Joseph Forebay	Columbia	1995-present	U.S. Army Corps of Engineers
CHQW	Chief Joseph Tailrace	Columbia	1997-present	U.S. Army Corps of Engineers
CWMW	Camas/Washougal WA	Columbia	1995-present	U.S. Army Corps of Engineers
DWQI	Dworshak Tailrace	NF Clearwater	1995-present	U.S. Army Corps of Engineers
FDRW	Grand Coulee Forebay	Columbia	1995-present	U.S. Army Corps of Engineers
GCGW	Grand Coulee Downstream (6 miles)	Columbia	1997-present	U.S. Army Corps of Engineers
HGHM	Hungry Horse Tailrace	SF Flathead	1998-present	U.S. Army Corps of Engineers
IHR	Ice Harbor Forebay	Snake	1995-present	U.S. Army Corps of Engineers
IDSW	Ice Harbor Tailrace	Snake	1995-present	U.S. Army Corps of Engineers
JDA	John Day Forebay (JDA/JDY)	Columbia	1995-present	U.S. Army Corps of Engineers
JHAW	John Day Tailrace	Columbia	1995-present	U.S. Army Corps of Engineers
LEWI	Lewiston ID	Clearwater	1997-present	U.S. Army Corps of Engineers
LBQM	Libby Downstream (LIBM/LBQM)	Kootenai	1995-present	U.S. Army Corps of Engineers
LGS	Little Goose Forebay	Snake	1995-present	U.S. Army Corps of Engineers
LGSW	Little Goose Tailrace	Snake	1995-present	U.S. Army Corps of Engineers
LWG	Lower Granite Forebay	Snake	1995-present	U.S. Army Corps of Engineers
LGNW	Lower Granite Tailrace	Snake	1995-present	U.S. Army Corps of Engineers
LMN	Lower Monumental Forebay	Snake	1969-present	U.S. Army Corps of Engineers
LMNW	Lower Monumental Tailrace	Snake	1995-present	U.S. Army Corps of Engineers
MCQW	McNary Forebay (Washington)	Columbia	1995-present	U.S. Army Corps of Engineers
MCQO	McNary Forebay (Oregon)	Columbia	1996-present	U.S. Army Corps of Engineers
MCPW	McNary Tailrace	Columbia	1995-present	U.S. Army Corps of Engineers
PAQW	Pasco WA	Columbia	2000-present	U.S. Army Corps of Engineers
PEKI	Peck ID	Clearwater	1997-present	U.S. Army Corps of Engineers
PRD	Priest Rapids Forebay	Columbia	1995-present	U.S. Army Corps of Engineers
PRXW	Priest Rapids Downstream	Columbia	1995-present	U.S. Army Corps of Engineers
RIS	Rock Island Forebay	Columbia	1995-present	U.S. Army Corps of Engineers
RIGW	Rock Island Tailrace	Columbia	1997-present	U.S. Army Corps of Engineers
RRH	Rocky Reach Forebay	Columbia	1995-present	U.S. Army Corps of Engineers
RRDW	Rocky Reach Tailrace	Columbia	1997-present	U.S. Army Corps of Engineers
TDA	The Dalles Forebay	Columbia	1995-present	U.S. Army Corps of Engineers
TDDO	The Dalles Tailrace	Columbia	1997-present	U.S. Army Corps of Engineers
WAN	Wanapum Forebay	Columbia	1995-present	U.S. Army Corps of Engineers
WANW	Wanapum Downstream	Columbia	1995-present	U.S. Army Corps of Engineers
WRNO	Warrendale OR	Columbia	1996-present	U.S. Army Corps of Engineers
WEL	Wells Forebay	Columbia	1995-present	U.S. Army Corps of Engineers
WELW	Wells Tailrace	Columbia	1998-present	U.S. Army Corps of Engineers

Hourly Water Quality Glossary

Barometric Pressure (BaroPr)

Barometric Pressure is atmospheric pressure as measured by the U.S. Army Corps of Engineers water quality monitoring site, given in mmHg.

Dissolved Gas (DisGas)

Dissolved gas is a measure of the pressure of dissolved gas in the water column as measured by the U.S. Army Corps of Engineers water quality monitoring site, given in mmHg. When spillway water plunges into the tailrace nitrogen is forced into the water at higher than normal levels. This condition, called supersaturation, occurs when dissolved gas pressure in the water actually exceeds the atmospheric pressure. Often collected at irregular intervals, this parameter may be missing values for one or more days, or reported values may be obviously incorrect. Daily averages are calculated from hourly values between 600 and 900 mmHg. Hourly values are reported as received from the USACE.

Dissolved Gas Percent (DisGasP)

Gas percent reflects the degree of total dissolved gas supersaturation in the river at the given location. When gas pressure is exactly the same as the atmospheric pressure, the water is considered to be 100% saturated. If the gas pressure value is higher than atmospheric pressure, gas percent values rise above 100%. Daily averages are calculated from hourly values within the range of 90% to 200%. Hourly measures are the derived value of (Dissolved Gas)/(Barometric Pressure) as reported by the USACE. Gas percent data is often quite variable due to rapid fluctuations in spill volumes and atmospheric pressures, as well as sensor errors.

Outflow

Outflow measurements represent the hourly measures reported by the U.S. Army Corps of Engineers at a project. Outflow is given in kcfs, thousands of cubic feet per second. This represents the total outflow at any project, including spill and fish ladder flow.

Spill

Spill measurements represent the hourly measures reported by the U.S. Army Corps of Engineers at a project. It is also given in kcfs, thousands of cubic feet per second.

Spill Percent (SpillP)

Spill Percent is calculated by DART from the hourly values for Spill divided by the hourly values for Outflow at a project. Spill percent is only available from the Composite Report.

Temperature (TempC)

Temperature is water temperature in degrees Celsius as measured by the U.S. Army Corps of Engineers water quality monitoring site. Hourly values are as reported by the USACE. Daily averages are calculated from hourly values above 0^oC and below 35^oC.

Additional Information

Please refer to the DART River Environment Metadata & Glossary to view additional information about each location, including DART daily datasets inventory.
Lower Columbia River Dissolved Gas Monitoring Network, USGS
Map of Water Quality Monitoring Network, USACE
Outflow and Spill data are collected at the project (dam). Barometric Pressure, Dissolved Gas, Dissolved Gas Percent, and Temperature (F) are measured at Water Quality Monitoring stations in the forebay and tailwater of most projects and other key locations in the basin.
Current monitoring station details (including river mile and lat/lon coordinates) can be found on the Total Dissolved Gas (TDG) Monitoring Station Summary Data Sheet, USACE Columbia Basin Water Management Division.
Operation dates vary by location and year.