Environmental Assessment on BPA's Proposed Funding of Lower Umatilla River Anadromous Salmonid Passage Enhancement Projects, FY 1983.

Technical Report · Fri Jul 01 00:00:00 EDT 1983

OSTI ID:5205294

United States. Bonneville Power Administration.

The major factors presently restricting fall and spring chinook reintroduction are the lack of adequate streamflows during spawning migration and resulting passage difficulties in the lower River and at Three Mile Falls. Maxwell and Cold Springs Diversion dams are also potential passage barriers during low flow years. In order to get fish past diversion structures and over shallow river bars, biologists generally feel that a minimum streamflow of 250-300 ft/sup 3/s is needed in September, October, November, May and June from the mouth of McKay Creek downstream to provide adequate transportation and spawning flow for adult fall and spring chinook. Three Mile Falls Diversion Dam is the highest diversion facility on the Umatilla River and is a formidable obstacle to anadromous fish. The lip of the dam passes a uniform flow over the crest, and fish are not necessarily attracted to the fish ladder entrance. While attempting to jump over the dam, adult steelhead have become trapped in the dam's buttress bays. Modification of the dam's passage facilities and the immediate downstream area would provide additional capacity to pass fish migration flows when water is available, improved screens and fish ladder accessibility, and a better defined channel by which the migrants can reach the fish ladders. 24 figs.

• Research Organization: USDOE Bonneville Power Administration, Portland, OR. Office of Power and Resources Management
• OSTI ID: 5205294
• Report Number(s): DOE/EA-0222; ON: DE88008259
• Country of Publication: United States
• Language: English

Related Subjects

13 HYDRO ENERGY
54 ENVIRONMENTAL SCIENCES
29 ENERGY PLANNING
POLICY AND ECONOMY
FISH PASSAGE FACILITIES
OPTIMIZATION
POWER GENERATION
ENVIRONMENTAL IMPACTS
ANADROMOUS FISHES
COLUMBIA RIVER
ENVIRONMENTAL EFFECTS
FLOW RATE
HYDROELECTRIC POWER
OREGON
SALMON
SURFACE WATERS
TROUT
ANIMALS
AQUATIC ORGANISMS
ELECTRIC POWER
ENERGY SOURCES
FEDERAL REGION X
FISHES
NORTH AMERICA
POWER
RENEWABLE ENERGY SOURCES
RIVERS
STREAMS
USA
VERTEBRATES
Fishways - Umatilla River
Fishery management - Environmental aspects
130600* - Hydro Energy- Environmental Aspects
520500 - Environment
Aquatic- Site Resource & Use Studies- (-1989)
290400 - Energy Planning & Policy- Energy Resources