Scientific Investigations Report 2006–5225
U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2006–5225
Sampling was done in the Columbia River about four river kilometers (rkm) downstream of Bonneville Dam. All collection efforts were made near Pierce and Ives Islands (fig. 1), at rkm 228.5 and 229.3, respectively.
The Columbia River downstream of Bonneville Dam is recognized as good white sturgeon spawning habitat, with successful recruitment to age-0 occurring each year. White sturgeon embryos are found in the first 11 km downstream of Bonneville Dam during spawning season (McCabe and Tracy, 1994). In the lower Columbia River, spawning occurs when water temperatures range from 10 to 18°C (Parsley and others, 1993).
The Columbia River immediately downstream of Bonneville Dam is highly regulated by discharge of the dam. Water surface elevations at Ives and Pierce Islands closely follow the amount of discharge from Bonneville Dam with minimal (< 0.3 m) tidal influence. The flow in the side channel that runs between the islands and the Washington shore is only slightly affected by the inflow of Hamilton and Hardy Creeks.
U.S.
Department of the Interior | U.S. Geological
Survey
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