U.S. Dept Commerce/NOAA/NMFS/NWFSC/Publications
NOAA-NWFSC Tech Memo-27: Status Review of West Coast Steelhead
Table 19. Summary of recent and historical abundance estimates for the Central California Coast evolutionarily significant unit. Excludes estimates from CDFG (1965) presented in Table 17.
River basin Abundance Years Reference
Russian River 65,000 1970 CACSS 1988
1,750 - 7,000 1994 McEwan and Jackson 1996
Laugunitas Creek 400 - 500 1990s McEwan and Jackson 1996
San Gregorio 1,000 1973 Coots 1973
Waddell Creek 481 1933 - 1942 Shapovalov and Taft 1954
250 1982 Shuman 1994
150 1994 Shuman 1994
Scott Creek 400 1991 Nelson 1994
<100 1991 Reavis 1991
300 1994 Titus et al. in press
San Vicente Creek 150 1982 Shuman 1994
50 1994 Shuman 1994
San Lorenzo River 20,000 before 1965 Johnson 1964, SWRCB 1982
1,614 1977 CDFG 1982
>3,000 1978 Ricker and Butler 1979
600 1979 CDFG 1982
3,000 1982 Shuman 1994
few 1991 Reavis 1991
<150 1994 Shuman 1994
Soquel Creek 500 - 800 1982 Shuman 1994
<100 1991 Reavis 1991
50 - 100 1994 Shuman 1994
Aptos Creek 200 1982 Shuman 1994
<100 1991 Reavis 1991
50 - 75 1994 Shuman 1994
Table 20. Summary of estimated total run size for the Central California Coast steelhead evolutionarily significant unit, by major river basin, as in Table 10. All data are for winter steelhead.

River basin		 Total
run size		 Total
escapement		 Natural
escapement		 Trend
(%/yr)		 Percent
hatchery
Russian River 1750 - 7000
Lagunitas Creek 500
Waddell Creek 150
Scott Creek <300
San Vicente Creek 50
San Lorenzo River <150
Soquel Creek <100
Aptos Creek <100
Table 21. Summary of recent and historical abundance estimates for the South-Central California Coast evolutionarily significant unit. Excludes estimates from CDFG (1965) presented in Table 17.
River basin Abundance Years Reference
Pajaro River 1,500 1964 McEwan and Jackson 1996
1,000 1965 McEwan and Jackson 1996
2,000 1966 McEwan and Jackson 1996
<100 1991 Nehlsen et al. 1991, Reavis 1991
Salinas River <100 1991 Nehlsen et al. 1991
Carmel River 20,000 1928 CACSS 1988
3,177 1964 - 1975 Snider 1983
2,000 1988 CACSS 1988
<4,000 1988 Meyer Resources 1988
few 100s 1991 Nehlsen et al. 1991
few 100s 1993 Titus et al. in press
Little Sur River <100 1991 Reavis 1991
Big Sur River <100 1991 Nehlsen et al. 1991
few 100s 1991 Reavis 1991
Table 22. Summary of estimated total run size and trends in total escapement for the South-Central California Coast steelhead evolutionarily significant unit, by major river basin, as in Table 10. All data are for winter steelhead.

River basin		 Total
run size		 Total
escapement		 Natural
escapement		 Trend
(%/yr)		 Percent
hatchery
Pajaro River <100
Salinas River <100
Carmel River 16 -21.9
Little Sur River <100
Big Sur River <100
Table 23. Summary of recent and historical abundance estimates for the Southern California steelhead evolutionarily significant unit. Excludes estimates from CDFG (1965) presented in Table 17.
River basin Abundance Years Reference
Santa Ynez River 20,000 - 30,000 historic Reavis 1991
20,000 historic Titus et al. in press
12,995 - 25,032 1940s Shapovalov and Taft 1954
20,000 1952 CDFG 1982
100 1991 Reavis 1991
<100 1991 Nehlsen et al. 1991
<100 1994 CCC 1994
Gaviota Creek 10s 1991 Reavis 1991
Ventura River 4,000 - 6,000 historic AFS 1991, Hunt et al. 1992, Henke 1994, Titus et al. in press
4,700 late 1940s CDFG 1982
<100 1980 Moore 1980
200 1991 Higgins 1991
<25 1991 McEwan and Jackson 1996
few 100s 1991 Reavis 1991
<100 1991 Nehlsen et al. 1991
200 1993 Nash 1993
<200 1994 CCC 1994
Matilija Creek 2,000 - 2,500 historic Clanton and Jarvis 1946
Santa Clara River 7,000 - 9,000 historic Moore 1980
9,000 historic Moore 1980, Comstock 1992, Henke 1994
6 1982 Puckett and Villa 1985
<100 1994 CCC 1994
<100 1991 Nehlsen et al. 1991
few 100s 1991 Reavis 1991
Malibu Creek 1,000 historic Nehlsen et al. 1991
<100 1991 Nehlsen et al. 1991, Reavis 1991
60 1991 AFS 1991
60 1993 Nash 1993
Table 24. Summary of estimated total run size for the Southern California steelhead evolutionarily significant unit, by major river basin, as in Table 10. All data are for winter steelhead.

River basin		 Total
run size		 Total
escapement		 Natural
escapement		 Trend
(%/yr)		 Percent
hatchery
Santa Ynez River <100
Ventura River <200
Santa Clara River <100
Malibu Creek <100
Table 25. Percentage of steelhead populations in three risk categories in southern California counties. Includes only those populations for which recent information exists. Based on data in Titus et al. (in press).

County		 No discernible
decline
Declining
Extinct
San Mateo 50% 50% 0%
Santa Cruz 19 81 0
Monterey 50 42 8
San Luis Obispo 25 62 13
Santa Barbara 0 27 73
Ventura/Los Angeles 9 27 64
Orange/San Diego 0 0 100
Table 26. Summary of recent and historical abundance estimates for the Central Valley steelhead evolutionarily significant unit. Excludes estimates from CDFG (1965) presented in Table 17.
River basin Abundance Years Reference
Sacramento River Basin 40,000 1961 Hallock et al. 1961
American River 19,583 1971, 1972 Stanley 1976
upper Sacramento River 20,540 1950s Hallock et al. 1961
10,000 1994 McEwan and Jackson 1996
Red Bluff Diversion Dam 11,187 1967 McEwan and Jackson 1996
2,202 1990 McEwan and Jackson 1996
Yuba River 2,000 1984 McEwan and Jackson 1996
Deer Creek 1,006 1964 McEwan and Jackson 1996
Mill Creek 417 - 2,269 1953 - 1963 McEwan and Jackson 1996
Mokelumne River <50 1974 - 1994 McEwan and Jackson 1996
Tuolumne River 66 1940 McEwan and Jackson 1996
Table 27. Summary of estimated total run size and trends in total escapement for the Central Valley steelhead evolutionarily significant unit, by major river basin, as in Table 10. All data are for winter steelhead.

River basin		 Total
run size		 Total
escapement		 Natural
escapement		 Trend
(%/yr)		 Percent
hatchery
Sacramento River (upper) 1,500 -9.0
Table 28. Summary of estimated total run size and escapement, trends in total escapement, and proportion of hatchery fish in escapement for the Middle Columbia River steelhead evolutionarily significant unit, by major river basin, as in Table 10. Run types are winter (W) or summer (S).

River basin		 Run
type		 Total
run size		 Total
escapement		 Natural
escapement		 Trend
(%/yr)		 Percent
hatchery
Klickitat River S 2,400 -9.2
Yakima River S 1,000 850 800 +14.0 5
Fifteenmile Creek W -5.4
Deschutes River S 11,300 3,000 +2.6 50
John Day River S >5,000 -14.6
Umatilla River S 1,700 +0.7 < 25
Touchet River S 650 300 300 -2.7 7
Table 29. Summary of estimated total run size and escapement, trends in total escapement, and proportion of hatchery fish in escapement for the Upper Columbia River steelhead evolutionarily significant unit, by major river basin, as in Table 10. All data are for summer steelhead.

River basin		 Total
run size		 Total
escapement		 Natural
escapement		 Trend
(%/yr)		 Percent
hatchery
Wenatchee River 2,700 2,500 800 +2.6 65
Methow & Okanogan Rivers 4,700 2,400 450 -12.0 81
Table 30. Summary of estimated total run size and escapement, trends in total escapement, and proportion of hatchery fish in escapement for the Snake River Basin steelhead evolutionarily significant unit, by major river basin, as in Table 10. All data are for summer steelhead.

River basin		 Total
run size		 Total
escapement		 Natural
escapement		 Trend
(%/yr)		 Percent
hatchery
Tucannon River 700 400 140 -18.3 57
Asotin Creek 200 200 -19.7
Grande Ronde River -3.5 to +3.9
Imnaha River (Camp Creek) +1.4 > 50
Rapid River 80 +1.7
Salmon River 150 - 1400 20 - 40 -30.0 to +0.1