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A contractor examines, categorizes, measures and then releases a salmonoid below Big Cliff Dam, east of Salem, Ore., May 28, 2021. Portland District, U.S. Army Corps of Engineers is using screw traps to measure downstream fish passage at Cougar, Lookout Point and Big Cliff dams. Corps biologists plan on using screw traps through at least 2022 to evaluate fish migration and may also use more refined methods, such as active tag studies to help give more precise data on fish passage, depending on funding. (U.S. Army photo by Tom Conning)
| Date Taken: | 05.28.2021 |
| Date Posted: | 06.17.2021 15:17 |
| Photo ID: | 6697887 |
| VIRIN: | 210528-A-EZ675-0078 |
| Resolution: | 6016x4016 |
| Size: | 7.67 MB |
| Location: | DETROIT, OR, US |
| Web Views: | 8 |
| 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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