[env-trinity] Trinity River High Flow Gravel Injection

[John Klochak]

Attention All Trinity River Boaters and Fishermen in Lewiston:

The Trinity River Restoration Program will be performing high flow gravel injections at two locations in Lewiston along the Trinity River between May 6 and May 10, 2008.  Approximately 2,500 tons of gravel will be put into the river at the Diversion Pool site just upstream of the new Lewiston bridge on Trinity Dam Boulevard and 1,000 tons of gravel will be put into the river at the California Department of Fish and Game Saw Mill Wildlife Area site at the end of Cemetery Road just downstream of the Cemetery Side Channel.  

The gravel is being placed into the river to replace gravel that is now trapped behind Trinity Dam.  As the gravel moves downstream with the high spring river flows, it creates the juvenile rearing and adult spawning habitat that is crucial to salmon and steelhead.

These injections will be accomplished by a truck mounted conveyor system that is able to extend up to 130 feet across the river.  The rock being conveyed into the river will range in size from 3/8” to 5”.  It will not be safe to pass through the river at these locations during the injection activities.  The contractor is allowed to work between the hours of 7:00 AM to 7:00 PM during this period.  If you are planning to be near the river at this time, please keep a safe distance from the gravel augmentation activities.


John R. Klochak
Restoration Ecologist
Technical Analysis and Modeling Group 
Trinity River Restoration Program
P.O. Box 1300
Weaverville, CA 96093
jklochak at mp.usbr.gov
(530)623-1810
FAX: (530)623-5944