Cascade Locks in Hood River County, Oregon — The American West (Northwest)
Bradford Island Fishway
Fish Ladder at Bonneville Dam
Photographed By Don Morfe, October 5, 2006
1. Bradford Island Fishway Marker
Inscription.
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).
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).
45° 38.511′ N, 121° 56.633′ W. Marker is in Cascade Locks, Oregon, in Hood River County. Marker is on Star Route. This marker is located on the grounds of Bradford Island-Bonneville Dam property administrated by the U.S. Corps of Engineers. Touch for map. Marker is in this post office area: Cascade Locks OR 97014, United States of America. Touch for directions.
5. Sign at the entrance to Bradford Island Bonneville Dam
Credits. This page was last revised on June 16, 2016. It was originally submitted on February 22, 2016, by Don Morfe of Baltimore, Maryland. This page has been viewed 577 times since then and 27 times this year. Photos:1, 2, 3, 4, 5. submitted on February 22, 2016, by Don Morfe of Baltimore, Maryland. • Bill Pfingsten was the editor who published this page.
