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A screw trap churns as water flow from the McKenzie River downstream of Cougar Dam turns an internal helical screw, May 28, 2021. Portland District, U.S. Army Corps of Engineers biologists use screw traps like these to create enough hydraulics to trap small fish so they can estimate how many fish may pass through a dam. (U.S. Army photo by Tom Conning)
| Date Taken: | 05.28.2021 |
| Date Posted: | 06.17.2021 15:17 |
| Photo ID: | 6697888 |
| VIRIN: | 210528-A-EZ675-0014 |
| Resolution: | 6016x4016 |
| Size: | 9.41 MB |
| Location: | COUGAR DAM, OREGON, US |
| Web Views: | 11 |
| Downloads: | 3 |
This work, Corps operates screw traps [Image 3 of 3], by Tom Conning, identified by DVIDS, must comply with the restrictions shown on https://www.dvidshub.net/about/copyright.
That sounds fishy: twisting traps troll tributaries in the Willamette
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