Project Name

Thomas Creek – Cox Flat Reconnaissance and Restoration Plan (NEW)

Watershed and Stream Assessments
Client / Agency
The Lake County Umbrella Watershed Council, U.S. Forest Service Fremont-Winema National Forest
Oregon Watershed Enhancement Board, U.S. Fish & Wildlife Service, and local landowners
Lakeview, Oregon
Project Description
The Lake County Umbrella Watershed Council in cooperation with the U.S. Forest Service Fremont-Winema National Forest, and local landowners, with funding provided by the Oregon Watershed Enhancement Board and U.S. Fish & Wildlife Service, retained River Design Group, Inc. to complete a reconnaissance and restoration project prioritization plan for Upper Thomas Creek near Lakeview, Oregon. RDG completed a stream reconnaissance to evaluate existing stream corridor conditions and to identify opportunities for improving stream function, aquatic habitat, and fish passage. Fish species of interest inhabiting the Thomas Creek watershed include Modoc suckers, Goose Lake redband trout, Goose Lake suckers, Goose Lake lamprey, and other endemic and native fish species.

Field data collected in 2011 and 2012, included field observations, culvert and channel surveys, and fish passage analyses. Field work was completed on mainstem Thomas Creek, an unnamed perennial tributary, and the lower extents of several unnamed tributaries in the Thomas Creek headwaters. Field data were processed and managed in AutoCAD Civil 3D and ArcGIS 10.1. Observations and ground photos were reviewed and used to develop the reconnaissance and project prioritization report.

The Thomas Creek – Cox Flat Reconnaissance and Restoration Plan provides an overview of historical and exiting stream corridor conditions, and offers suggestions for improving the stability and ecological function of the stream corridor. Recommended actions are tiered towards improving stream corridor management, address active headcuts, and addressing fish passage barriers that currently limit stream network connectivity.
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Project Images

A beaver dam in Upper Cox Flat. The beaver dam is part of a large beaver dam complex.
An undersized culvert at the 28 Road is a fish passage barrier and affects sediment continuity.
An active headcut in Upper Cox Flat.
Thomas Creek interfaces with a terraces and receives road ditch discharge in Lower Cox Flat.
A boulder weir has stabilized the channel but is a fish passage concern.
Log and rock weirs on Thomas Creek provide habitat diversity but are a base flow fish passage concern.
A rock grade control structure on an unnamed tributary is a fish passage concern.
View up the valley in Cox Flat proper.
Plane bed channel conditions in the Thomas Creek canyon downstream from Cox Flat.