Restoration Program

Program Administration

Hocker Flat Pilot Project

TRRP scientists have estimated that a three to four-fold increase in juvenile rearing habitat will be necessary to achieve a doubling of the naturally-spawning anadromous Trinity River fish populations. Hocker Flat was the first of 47 sites designed and constructed under the TRRP to provide this increased habitat. The channel rehabilitation site was designed by engineers at the California Department of Water Resources in cooperation with other TRRP partners.

A construction proposal was solicited in mid-March 2005, and a local 8A contractor, Erick Ammon, Inc. of Salyer, CA was selected. The contract was awarded in late July and construction began in early September 2005. Earthwork, including lowering of the floodplain by approximately four feet and requiring removal of over 80,000 cubic yards of material, was completed in late October 2005. Planting of native vegetation was completed during February 2005 (see Riparian Vegetation for details).

Key components of the Hocker Flat Project included:

• Riparian berm removal, bank feathering, floodplain lowering, and tributary enhancement
• 83,000 cubic yards of excavation
• Construction: September through October 2005
• Revegetation: November 2005 to March 2006

Project Area Photos

Area R2 Feathered Edge & Floodplain

September 1, 2005	September 12, 2005
December 12, 2006, looking up-river	December 12, 2006 - looking down-river

Pre-project conditions, after initial clearing (February 2005)

As-built conditions (September 2005)

October 24, 2006

Area R4, Floodplain

September 2, 2005	September 12, 2005
October 24, 2006

National Environmental Policy Act (NEPA) documents for this project are available at the Trinity River Restoration Program Office in Weaverville, CA, at 530-623-1800.