Bradford Island Fishway - Bonneville OR
Posted by: 
Don.Morfe
N 45° 38.511 W 121° 56.633
10T E 582303 N 5054798
The Bradford Island Fishway is a long, inclined flume with horizontal weirs creating a series of successive pools. Each pool is one foot higher than the adjacent pool downstream.
Waymark Code: WM13JDP
Location: Oregon, United States
Date Posted: 12/24/2020
Views: 6
TEXT from Historical Marker at the site: Bradford Island Fishway-
Fish Ladder at Bonneville Dam-- Migrating fish are attracted to large flows of water coming from the Bonneville Dam. To take advantage of this natural reaction, fish-collection facilities are placed along the face of the powerhouse and at each end of the spillway dam. These collection facilities attract fish with their own flow of water, which leads fish into the fishways.
The Bradford Island fishway is a long, inclined flume with horizontal weirs creating a series of successive pools. Each pool is one foot higher than the adjacent pool downstream. Fish may swim through submerged artifices or over the wier crests to move from one pool to the next higher one.
The upper portion of the Bradford Island fishway was recently reconstructed. Instead of the weirs found in the lower reaches of the fishway, the new design creates and inclined series of vertical slots and eddy-lice pools. Biological research has shown that these inclined pools are superior for fish passage and allow for self-regulating control of water in the fishway.
As they near the top of the fishway, the fish pass the counting station and move by the winding windows. You are invited to watch the underwater viewing area located on level 1 (down the stairs).
River/Waterway: Columbia River
|
Visit Instructions:
Please share a self-made picture of the Fish Ladder and tell us something about it. Did you see any fishes? You do not have to be in the picture, neither does your GPSr.