Project: Lower Monumental 1:40-scale Sectional Model
PI: Steve Wilhelms
Project Description/Activities/Capabilities:
The purpose of the Lower Monumental 1:40-scale section model was to identify operational and
structural changes that may reduce stilling basin erosion and downstream dissolved gas
concentrations, while minimizing impacts on other river uses.
Sponsor: Walla Walla District. POC Dan Katz.
Personnel: Steve Wilhelms, TEM Murphy, Laurin Yates, Calvin Buie
Project Location and Description:
Lower Monumental Dam is located at River Mile 41.6 on the Snake River in Franklin and Walla
Walla Counties, Washington. The dam is about 3800 feet long and includes a powerhouse,
spillway, navigation lock, and two fish ladders (Figure 1). The powerhouse is on the north end of
the dam and consists of six Kaplan turbines, each with a 135,000-kilowatt generator. Maximum
discharge through the powerhouse is approximately 120 kcfs . The spillway is 512 feet long and
has eight 50 ft-wide by 60 ft-high tainter gates. The spillway crest is at elevation 483.0 with a
normal pool elevation of 540.0.
Facilities: Bldg. 7001
Related Topic Areas: Physical models, dissolved gas, debris movement, flow deflectors, rivers,
reservoirs, hydraulic structures, fish passage, surface water, hydropower, erosion
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