PENDLETON, Ore. -- Research on the Umatilla River in northeast Oregon shows fixing irrigation dams has allowed more of the protected steelhead and salmon to pass through.
The East Oregonian says biologist Craig Contor of the Confederated Tribes of the Umatilla Indian Reservation recently delivered a report on the work.
Contor says that in the 1990s few fish made it upstream to spawn because the fish ladders at dams were clogged with gravel or were above the water line because of erosion.
He says adding rocks in the river and cleaning out the gravel in the ladders helped the fish.
He says nearly 1,000 fish have been tagged with tracking devices since 2009, and nearly all made it through the spawning system.