USGS hydrologic technician James Foreman operates an electronic deployment reel from a bridge over the Elwha River, Washington. Two large dams on the Elwha River are being incrementally removed from 2011 to 2013 to restore river function in an important salmon-bearing river.
Water quality sampling from a bridge
By Washington Water Science Center
March 1958 (approx.)
![Two men stand next to a small crane on a bridge. A sampling instrument is suspended from the crane.](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/full_width/public/media/images/img405.jpg?itok=mUjqq8_U)
Detailed Description
Hydrologic Technicians use bridge cranes and reels to collect water quality samples. Similar technology is still in use today.
Sources/Usage
Public Domain.