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Surface-Water/Groundwater Interactions and Near-Stream Groundwater Quality, Lacamas Creek, Clark County

Publication number Date Published
13-03-015March 2013
VIEW NOW Surface-Water/Groundwater Interactions and Near-Stream Groundwater Quality, Lacamas Creek, Clark County (Number of pages: 56) (Publication Size: 10097KB)

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Author(s) Sinclair, K. and T. Swanson
Description This study was undertaken to evaluate groundwater’s influence on the temperature and water quality of Lacamas Creek which was listed on the Washington State 2008 303(d) summary of impaired waters. Several techniques were used during this effort to derive point- and reach-based estimates of the volume and quality of groundwater entering the creek. During a seepage evaluation on July 26, 2011, the creek gained approximately +1.34 ft3/s from groundwater discharge between river miles 14.8 and 5.6. During a follow-up evaluation on August 30, 2011 the creek lost -2.73 ft3/s across this reach. Groundwater samples collected from 6 instream piezometers and 1 spring had measurable concentrations of dissolved orthophosphate (range <0.003 to 0.276 mg/L), dissolved total phosphorus (range 0.0221 to 0.602 mg/L), dissolved nitrate+nitrite-N (range <0.01 to 0.292 mg/L), and dissolved ammonia (range 0.014 to 2.83 mg/L).
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Keywords Lacamas, surface water/groundwater interaction, TMDL, groundwater
WATERSHED Water Resource Inventory Area 28 Salmon-Washougal
DATA Environmental Information Management (EIM) #TSWA0003


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