Ice Harbor Lock and Dam General Model

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Ice Harbor Lock and Dam General Model

Purpose: To evaluate hydraulic performance and document resulting flow conditions associated with proposed fish

passage modifications to the Ice Harbor Lock and Dam.

Background: The powerhouse at Ice Harbor

Dam consists of 6 hydropower turbines with a

combined capacity of 105 kcfs. The spillway

has a total width of 590 feet and consists of 10

gate-controlled bays. The horizontal apron-

type stilling basin at Ice Harbor Dam is about

210 ft long with an invert elevation of 304 ft.

With normal tailwater at el 344, the depth in

the stilling basin was about 40 ft. One row of

8-ft-high baffle blocks and a 12-ft end sill

provide energy dissipation in the stilling basin.

The eight central bays have 12.5 ft long

spillway deflectors at elevation 338. The two

end bays have 12.5 ft long spillway deflectors

at elevation 334. The interior piers were

extended to the downstream end of the

deflector to reduce surface turbulence and air entrainment. A splitter wall separates exterior bays 1 and 10 from the

interior bays. The tailwater channel downstream of the stilling basin is generally above elevation 320 ft with the

exception of a large depression located upstream of the end of the lock guide wall. Beyond the immediate vicinity

of the tailrace, the river is generally shallow except for the navigation channel, which was excavated on the northern

side of the thalweg, providing depths of 25-30 ft.

Facts: At the request of ths

Laboratory. The model reproduces the Ice Harbor Lock and Dam, 2200- ft of the upper pool and 4300-ft of the

tailrace. The model has been used to evaluate the hydraulic performance of spillway flow deflectors, behavioral

guidance structures, a raised tailrace just downstream of the spillway endsill, training wall extensions and removable

spillway weirs. It has also been used to design and evaluate structures for improving navigation conditions in the

tailrace.

Points of Contact: For additional information, please contact

Mr. Dwayne Fuller at 601-634-2668 ( ),

Mr. Glenn Davis at 601-634-4183 ( ) or

Mr. Dennis Markle at 601-634-3680 ( )