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https://hdl.handle.net/11681/47528| Title: | John Day Dam, Columbia River, Oregon and Washington : Hydraulic Model Investigations |
| Authors: | Johnson, Richard L. Perkins, Louis Z. |
| Keywords: | Hydraulic models Hydraulic structures John Day Dam (Or. and Wash.) Columbia River |
| Publisher: | United States. Army. Corps of Engineers. Walla Walla District. |
| Abstract: | The John Day Project includes a 20-bay spillway, a 20-unit powerhouse (ultimate installation), a single-lift navigation lock 86 ft wide by 675 ft long with a maximum lift of 113 ft, and a 24-ft-wide fish ladder on each bank of the river. Average head on the structures is about 105 ft. Excavation requirements, diversion plans, structure locations, and methods of project operation were studied in a 1:80-scale model that reproduced 2.9 miles of river channel and pertinent overbank topography. A 1:25-scale model was used to determine maximum limits for completion of skeleton powerhouse units through which the river would be diverted during third-stage construction. Improved designs were developed for the first- and second-step cofferdams, navigation lock approaches, temporary and permanent fishway entrances, auxiliary water intake for the Oregon shore fishway, powerhouse tailrace, skeleton units, and disposal fills. Limits for an interim cofferdam on the Oregon shore were evaluated; and satisfactory methods for operation of the completed spillway and fishway entrances were determined. |
| Description: | Technical Report |
| Rights: | Approved for Public Release; Distribution is Unlimited |
| URI: | https://hdl.handle.net/11681/47528 |
| Appears in Collections: | Technical Reports |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| Technical Report No 90-1.pdf | 65.84 MB | Adobe PDF |  View/Open |