Projects

Project Name

Sycan River Assessment & Restoration Prioritization Plan

Category
Watershed and Stream Assessments
Client / Agency
US Fish and Wildlife Service
Location
Beatty, Oregon
Date
2005 to 2007
Project Description
USFWS retained RDG to prepare an assessment and restoration feasibility study on 7 miles of the Sycan River near Beatty, Oregon. The river has been affected by a long period of season long grazing. RDG integrated GPS data into a LiDAR/bathymetry data set characterizing the project area. A calibrated hydraulic model was developed to evaluate channel hydraulics and flood elevations associated with the flood frequency. Flood inundation maps were compared to flood air photos to determine accuracy. Recommendations included grazing cessation, revegetation, and habitat augmentation with large wood structures.
Back to Projects
Zoom View

Project Images

Overgrazing on the Sycan River has lead to widespread streambank instability and sediment delivery to the river Block failures contribute sediment to the river Sedges and willows now buffer the former vertical banks from the active river Hydraulic modeling using a LiDAR-bathymetry data set was employed to evaluate floodplain inundation frequency Proposed actions included fencing the riparian corridor
Overgrazing on the Sycan River has lead to widespread streambank instability and sediment delivery to the river
Overgrazing on the Sycan River has lead to widespread streambank instability and sediment delivery to the river.
Block failures contribute sediment to the river
Block failures contribute sediment to the river. Poor toe stability and degraded riparian vegetation communities increase streambank failure potential.
Sedges and willows now buffer the former vertical banks from the active river
An upstream reference reach that has been in a grazing exclusion suggests the substantial benefits of limiting grazing adjacent to the river. Sedges and willows now buffer the former vertical banks from the active river.
Hydraulic modeling using a LiDAR-bathymetry data set was employed to evaluate floodplain inundation frequency
Hydraulic modeling using a LiDAR-bathymetry data set was employed to evaluate floodplain inundation frequency.
Proposed actions included fencing the riparian corridor
Proposed actions included fencing the riparian corridor. Fencing alternatives were prepared based on expected floodplain inundation associated with regular flood events.