Modification of Fish Ladders at John Day Dam, Columbia River, Oregon and Washington; Hydraulic Model Investigation.
Abstract
Prototype operation of the originally constructed fish ladders at John Day Dam revealed the need for ladder modifications to improve fish passage. A 1:10-scale model was used to evaluate the design modifications for both the north-and south-shore ladders. Improvements were desired in the flow-regulating sections and at the fish counting station for both fish ladders. The model was instrumental in developing a successful modification to the Hell's Gate slot-orifice type regulating section. The modification consisted of a slot-only design having a maximum head drop of approximately 6 inches. A vertical counting station was developed for the north-shore ladder. Successful operation in the prototype has verified the effectiveness of the design.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1984
- Accession Number
- ADA146398
Entities
People
- Pauline Smith