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CDFG Instream Structures Failure Rates for 1993 and 1995

Instream Structures

Data from Hopelain (1995):


Above: CDFG found that 60% of instream structures surveyed in 1993 were functioning as intended. The chart above shows only a subset of the locations surveyed in 1993. Data from Hopelain (1995).	Above: After high flows in 1995, CDFG found that the average of only 39% of instream structures surveyed remained functional. Some new streams were surveyed in 1995. Data from Hopelain (1995).

References

Hopelain, J. 1995 . Draft Evaluation of Salmonid Habitat Restoration Structures in Northwestern California Streams Conducted During 1993 and 1995. CDFG Inland Fisheries, Sacramento, CA. Draft dated 2/17/98. 30 p.

Table of Contents for Background Pages
Stream Conditions:	Water Quality	Sediment	Riparian	Big Wood	Habitat Types
Watershed Conditions:	Vegetation Types	Slope Stability	Roads & Erosion	Cumulative Impacts	Urbanization
Fish & Aquatic Life:	Fish Populations	Amphibians	Aquatic Insects	Hatcheries	Fish Disease
Restoration:	Stream Clearance	In-stream Structures	Riparian	Watershed	Strategy
Geology / Hydrology:	Geology	Soils	Precipitation	Stream Flow	Channel Processes
Policy & Regulation	ESA	TMDL	Forest Rules	1603 Permits	Water Rights