Watershed Map Hwy 1 Keys Creek Sonoma County Marin County Downstream extent of study area Laguna Lake Chileno Creek T o m a l e s B a y Sonoma County Frink Canyon Walker Creek Ma rshall-petaluma Rd Verde Canyon Upstream extents of study study area Salmon Creek Soulejule Reservoir Marin County Pacific Ocean San Francisco Bay 1:100,000 0 0.5 1 2 3 Miles Source: Pt. Reyes Quad
Project Location Map Chileno Creek Downstream extent of study area Walker Creek Upstream extents of study area Frink Canyon Sonoma County Marin County Marshall-Petaluma Rd Verde Canyon Salmon Creek Pacific Ocean San Francisco Bay 1:48,000 0 0.25 0.5 1 1.5 Miles Soulejule Reservoir Source: Pt. Reyes Quad
Coho Redd Live Coho Chileno Creek C h i len o C re e k Coho Carcass Steelhead Redd Live Steelhead Redd (unknown) Live (unknown) Lamprey Carcass Reach Break Reach D W ek C h il e no C k e a lk e r C r Reach C Ca ny o n C r eek Reach B Re Ve rd Figure 3: Survey Reaches and Fish/Redd Observations from 2006/2007 Adult Coho Spawner Surveys Marin County, California Project Location 0 0 500 2,000 Meters 1,000 Feet 4,000 Ar r o s a l, ach A ec any yo on C re ek F ri nk Sa lm o n Cr e e k u Sa e re
Reach D Walker Creek Chileno Creek Coho Redd Steelhead Redd Live Steelhead ") Steelhead Carcass Unknown Redd Unknown Live Fish Reach Break ") Frink Canyon Creek ") ") Walker Creek Reach C Reach B Verde Canyon Creek Reach A ") ") Salmon Creek Figure 4. Survey Reaches and Fish/Redd Observations from 2007/2008 Adult Coho Spawner Surveys Marin County, California Project Location ^ Meters 0 500 1,000 oyo Feet 0 2,500 5,000
2 FRINK CANYON CREEK 1 WALKER CR. ABOVE ZWART BRIDGE Walker Creek Juvenile Coho Salmon Abundance 1-2 3-6 7-13 14-17 18-29 Electrofishing Survey Areas Frink Canyon Creek 3 WALKER CR. NEAR USGS GAGE 5 VERDE CANYON CR. Verde Canyon Creek 4 WALKER CR. NEAR RANCH 6 WALKER CR. BELOW GAMBONINI Sausal, Arroyo 7 SALMON CREEK Reach Break Salmon Creek Figure 5. Walker Creek Juvenile Coho Salmon Survey Locations and Observations Marin County, California Project Location ^ Meters 0 500 1,000 Feet 0 2,500 5,000
!^ BMI Sampling Locations Walker Creek Frink Canyon Creek ALDER FLATS!^!^ SANDY FLATS Verde Canyon Creek Figure 6. Walker Creek Benthic c Macroinvertebrates Survey Locations Marin County, California Project Location ^ Meters 0 500 1,000 Feet 0 2,500 5,000
Table 1. Walker Creek Coho Salmon Life History Timeline. 40
Table 2. Salmonid Plantings and Monitoring Observations 2004-2010. 41
Table 3. Fish observations from 2006-2007 Walker Creek spawner surveys. Date Reach Fish Number Certainty of Species ID* Live Fish or Carcass Sex Certainty of sex ID* FL Fish on Redd? Carcass Data (cm) no/yes (redd #) Tag # recapture? COHO SALMON 1/3/07 B WC010307-B02 1 Carcass M (jack) 1 41 no WC-B-C01 No 1/3/07 B WC010307-B05 1 Live Fish F 2 56 yes (WC-B02) 1/9/07 D WC010907-D01 2 Live Fish F 1? yes (WC-D07) -- -- 1/9/07 D WC010907-D06 1 Carcass M (jack) 1 46 no WC-D-C01 No STEELHEAD 1/3/07 B WC010307-B03 2 Live Fish F 2 53 yes (WC-B04) -- -- 1/3/07 B WC010307-B04 2 Live Fish M 2 53 yes (WC-B04) -- -- 1/9/07 D WC010907-D02 1 Live Fish M 1? yes (WC-D10) -- -- 1/9/07 D WC010907-D03 1 Live Fish F 1? yes (WC-D10) -- -- 1/9/07 D WC010907-D04 1 Live Fish F 2? yes (WC-D09) -- -- 1/9/07 D WC010907-D05 1 Live Fish? --? no -- -- 1/19/07 A WC011907-A01 1 Live Fish? -- 56 no -- -- 1/19/07 C WC011907-C01 1 Live Fish? --? no -- -- 1/30/07 D WC013007-D07 1 Live Fish? -- 55 yes (WC-D04) -- -- 1/30/07 D WC013007-D08 1 Live Fish? -- 50 no -- -- 1/30/07 D WC013007-D09 1 Live Fish? -- 55 no -- -- LAMPREY 1/19/07 C WC011907-C02 1 Carcass? --? no -- -- UNKNOWN 1/03/07 B WC010307-B01 -- Live Fish? -- 25 yes (WC-B01) -- -- *Certainty of species/sex ID: 1= sure (distinguishing characteristics confirmed) 2= may be one species or another (not all characteristics seen) 3= unknown 42
Table 4. Redd observations from 2006/2007 Walker Creek spawner surveys. Date Reach Redd # Pot Dimensions Tail Spill Dimensions Fish on Redd? L (m) W (m) D (m) L (m) W1 (m) W2 (m) yes/no COHO SALMON 1/3/07 B WC-B02 5.5 3.1 0.15 3.1 2.4 1.4 yes (single F) 1/9/07 D WC-D02 3.0 2.0 0.20 2.1 1.4 1.2 no 1/9/07 D WC D05 8.2 4.6 0.20 4.3 4.0 3.7 no 1/9/07 D WC-D07 1.8 4.0 0.22 4.9 3.7 2.7 Yes (single F) 1/19/07 B WC-B05 1.3 1.4 0.13 1.3 1.1 0.8 no 1/19/07 C WC-C03 1.9 1.4 0.20 2.0 1.1 1.0 no 1/30/07 C WC-C05 1.4 0.9 0.15 2.9 1.5 1.2 no STEELHEAD 1/3/07 B WC-B01 0.6 0.5 0.18 0.6 0.4 0.3 yes (single?) 1/3/07 B WC-B03 1.0 0.6 0.60 0.6 0.5 0.3 no 1/3/07 B WC-B04 0.8 0.9 0.15 0.9 0.6 0.5 yes (M/F pair) 1/9/07 D WC-D03 0.9 0.6 0.10 0.5 0.5 0.3 no 1/9/07 D WC-D04 1.2 1.5 0.30 1.1 0.9 0.6 no 1/9/07 D WC-D09 0.6 0.8 0.10 1.2 0.6 0.5 no 1/9/07 D WC-D10 2.1 2.0 0.20 3.2 1.4 1.2 no 1/9/07 D WC-D11 1.7 1.2 0.20 2.3 0.9 0.6 no 1/9/07 D WC-D12 1.8 1.1 0.20 2.3 0.8 0.6 no 1/9/07 D WC-D13 0.9 0.9 0.20 0.9 0.8 0.6 no 1/19/07 B WC-B06 0.9 0.6 0.16 1.0 0.7 0.5 no 1/19/07 B WC-B07 0.9 0.6 0.27 0.5 0.6 0.5 no 1/19/07 C WC-C02 1.2 1.1 0.30 2.4 1.1 0.9 no 1/19/07 C WC-C01 1.2 0.9 0.20 0.9 1.0 1.0 no 1/30/07 C WC-C06 2.0 0.8 0.25 0.6 0.9 0.6 no 1/30/07 D WC-D15 1.5 0.9 0.18 1.5 0.7 0.7 no 1/30/07 D WC-D16 1.2 1.1 0.25 1.6 1.0 0.8 no 1/30/07 D WC-D17 1.6 1.1 0.28 2.2 1.0 1.0 no 1/30/07 D WC-D19 2.2 1.3 0.23 1.8 1.3 1.0 no UNKNOWN 1/9/07 D WC-D01 3.4 1.2 0.30 2.1 0.9 0.6 no 1/9/07 D WC-D06 1.2 1.5 0.30 1.1 0.8 0.6 no 1/9/07 D WC-D08 2.0 1.2 0.20 1.1 0.8 0.5 no 1/19/07 B WC-B08 0.9 1.9 0.24 1.0 0.8 0.6 no 1/19/07 C WC-C04 1.5 1.8 0.35 0.8 1.3 1.0 No 1/30/07 C WC-C07 1.2 1.4 0.18 1.4 0.9 0.6 No 1/30/07 D WC-D14 3.3 2.5 0.23 2.8 1.9 1.6 No 1/30/07 D WC-D18 2.9 2.0 0.20 2.9 1.5 1.1 No 43
Table 5. Fish observations from 2007/2008 Walker Creek spawner surveys. Date Reach Observation # Certainty of spp ID* Live or Carcass Sex Certainty Fish on Redd? of sex ID* no/yes (redd #) COHO SALMON no adult coho observed (live fish or carcasses) STEELHEAD 01/15/08 B WC-F-B02 1 live?? no 01/15/08 B WC-F-B09 1 live F 1 yes (WC-R-B05) 01/15/08 B WC-F-B10 1 live M 1 yes (WC-R-B05) 01/15/08 B WC-F-B11 1 live F 1 yes (WC-R-B06) 01/15/08 B WC-F-B12 1 live M 1 yes (WC-R-B06) 01/15/08 B WC-F-B13 1 live M 1 No 01/15/08 C WC-C-C01 1 carcass?? No 01/15/08 C WC-F-C02 1 live?? yes (WC-R-C04) 2/8/08 B WC-F-B14 1 live F 1 yes (WC-R-B14) 2/8/08 B WC-F-B15 1 live M 1 yes (WC-R-B15) 2/8/08 B WC-F-B16 1 live?? No 2/12/08 C WC-C-C02 1 carcass?? No 2/19/08 B WC-C-B01 1 carcass?? No 2/19/08 B WC-C-B02 1 carcass?? No 3/10/08 B WC-F-B17 1 live F 1 No 3/10/08 C WC-C-C03 1 carcass?? No UNKOWN 01/15/08 B WC-F-B01 3 live?? yes (WC-R-B02) 01/15/08 B WC-F-B03 3 live F 1 yes (WC-R-B03) 01/15/08 B WC-F-B04 3 live?? yes (WC-R-B03) 01/15/08 B WC-F-B05 3 live?? yes (WC-R-B03) 01/15/08 B WC-F-B06 3 live?? No 01/15/08 B WC-F-B07 3 live?? No 01/15/08 B WC-F-B08 3 live?? No 01/15/08 C WC-F-C01 3 live?? No 01/15/08 C WC-F-C03 3 live?? yes (WC-R-C05) *Certainty of species/sex ID: 1= sure (distinguishing characteristics confirmed) 2= may be one species or another (not all characteristics seen) 3= unknown 44
Table 6. Redd observations from 2007/2008 Walker Creek spawner surveys. Date Reach Redd # Pot Dimensions Tail Spill Dimensions Fish on Redd? L (m) W (m) D (m) L (m) W1 (m) W2 (m) yes/no COHO SALMON 12/27/07 B WC-R-B01 2.4 2.8 0.18 2.7 2.0 1.6 No 2/8/08 B WC-R-B11 3.9 2.4 0.15 1.4 2.0 1.0 No 2/8/08 B WC-R-B15 8.5 x 3.2 x 0.25 overall No 2/8/08 B WC-R-B16 9.3 x 2.6 x 0.28 overall No STEELHEAD 1/15/08 B WC-R-B04 1.1 0.8? 1.2 0.9 0.7 No 1/15/08 B WC-R-B05?????? yes (WC-F-B09/10) 1/15/08 B WC-R-B06?????? yes (WC-F-B11/12) 1/15/08 C WC-R-C01 1.0 0.6 0.15 0.7 0.6 0.4 No 1/15/08 C WC-R-C02 1.1 2.2 0.18 1.6 2.4 2.0 No 1/15/08 C WC-R-C03 1.2 0.8 0.22 1.9 0.8 0.7 No 1/15/08 C WC-R-C04 1.3 0.9 0.19 1.5 0.9 0.8 yes (WC-F-C02) 1/24/08 D WC-R-D01 0.9 1.2 0.18 1.8 1.0 0.9 No 2/8/08 B WC-R-B08 1.1 0.7? 1.3 0.9 0.6 No 2/8/08 B WC-R-B09 1.1 1.1 0.30 1.1 0.9 0.7 No 2/8/08 B WC-R-B12 1.6 1.0 0.28 2.1 0.8 1.1 No 2/8/08 B WC-R-B13 1.3 1.1 0.25 2.5 1.0 0.7 No 2/8/08 B WC-R-B14?????? yes (WC-F-B14/15) 2/8/08 B WC-R-B17 0.7 0.6 0.12 0.6 0.6 0.4 No 2/12/08 C WC-R-C06 1.6 1.5 0.25 2.2 1.4 0.9 No 2/12/08 C WC-R-C07 3.4 2.0 0.21 3.5 1.2 1.1 No 2/12/08 C WC-R-C08 0.6 0.7 0.17 0.9 0.7 0.4 No 2/12/08 C WC-R-C09 0.8 1.4 0.15 5.3 1.6 1.6 No 2/12/08 C WC-R-C10 1.9 1.9 0.32 2.7 1.8 1.7 No 2/12/08 C WC-R-C11 0.9 1.4 0.17 3.2 1.3 0.8 No 2/12/08 C WC-R-C12 1.3 1.1 0.28 1.5 1.2 0.9 No 2/12/08 C WC-R-C13 0.4 0.7 0.09 0.6 0.5 0.3 No 2/12/08 C WC-R-C14 1.4 1.0 0.18 2.4 1.1 0.9 No 2/12/08 C WC-R-C15 2.3 1.1 0.11 3.3 1.2 0.8 No 2/12/08 C WC-R-C16 1.2 1.6 0.14 1.6 0.8 0.5 No 2/12/08 C WC-R-C17 1.4 1.2 0.20 1.7 1.0 0.8 No 2/12/08 C WC-R-C18 0.5 1.7? 0.5 0.8 0.6 No 2/12/08 C WC-R-C19 0.9 0.9? 0.5 0.7 0.6 No 2/12/08 C WC-R-C20 0.9 1.0 0.11 1.2 1.0 0.6 No 2/19/08 B WC-R-B18 2.5 x 1.0 x 0.09 overall No 2/19/08 B WC-R-B19 1.7 x 0.8 x 0.28 overall No 2/19/08 C WC-R-C21 1.0 0.8 0.12 0.8 0.75 0.7 No 2/19/08 C WC-R-C22 1.0 0.6 0.25 0.5 0.6 0.4 No 45
Table 6 (continued). Redd observations from 2007/2008 Walker Creek spawner surveys. Date Reach Redd # Pot Dimensions Tail Spill Dimensions Fish on Redd? L (m) W (m) D (m) L (m) W1 (m) W2 (m) yes/no STEELHEAD continued 3/10/08 B WC-R-B20?????? yes (WC-F-B17) 3/10/08 B WC-R-B21 1.3 0.8 0.09 0.7 0.5 0.4 No 3/10/08 B WC-R-B22 0.6 0.7 0.20 1.2 0.6 0.5 No 3/10/08 B WC-R-B23 1.1 0.8 0.27 1.2 1.0 0.7 No 3/10/08 B WC-R-B24 0.8 0.8 0.18 1.1 0.7 0.6 No 3/10/08 C WC-R-C23 1.3 1.2 0.17 1.4 1.0 0.7 No 3/10/08 C WC-R-C24 1.1 1.4 0.15 1.5 1.0 0.8 No 3/10/08 C WC-R-C25 1.0 1.3 0.19 0.9 0.8 0.6 No 3/10/08 C WC-R-C26 0.7 0.6 0.19 0.5 0.7 0.5 No 3/10/08 C WC-R-C27 1.2 0.9 0.20 0.9 0.7 0.5 No 3/10/08 C WC-R-C28 0.9 0.9 0.18 0.8 0.7 0.6 No 3/10/08 C WC-R-C29 0.7 1.1 0.12 0.8 1.0 0.6 No 3/10/08 C WC-R-C30 0.9 1.5 0.20 0.8 1.0 0.6 No UNKNOWN 1/15/08 B WC-R-B02 1.4 0.7? 1.3 0.8 0.6 yes (WC-F-B01) 1/15/08 B WC-R-B03 3.3 2.4? 1.2 0.9 0.7 yes (WC-F-B03/4/5) 1/15/08 C WC-R-C05?????? yes (WC-F-C03) 2/8/08 B WC-R-B07 1.8 1.2 0.26 2.6 0.9 0.7 No 2/8/08 B WC-R-B10 1.7 1.6 0.18 1.2 1.0 0.7 No 46
Table 7. Redd observations from 2008/2009 Walker Creek spawner surveys. Date Reach Redd # Pit Dimensions Tail Spill Dimensions Fish on Redd? L (m) W (m) D (m) L (m) W1 (m) W2 (m) yes/no COHO SALMON 1/23/09 B WC-R-B01 3.7 3.2 0.5 2.8 2.7 2.0 No STEELHEAD 1/23/09 C WC-R-C01 2.9 x 1.8 x 0.21 overall No 2/12/09 C WC-R-C02 3.2 x 1.5 x 0.12 overall No 2/12/09 C WC-R-C03 1.2 x 0.5 x 0.1 overall No 2/12/09 C WC-R-C04 1.2 x 0.9 x 0.07 overall No 2/12/09 C WC-R-C05 2.3 x 1.1 x 0.07 overall No 2/12/09 C WC-R-C06 2.9 x 1.2 x 0.18 overall No 2/12/09 B WC-R-B03 4.7 x 1.1 x 0.18 overall No 2/12/09 B WC-R-B04 4.4 x 1.1 x 0.16 overall No 3/19/09 B WC-R-B05 3.8 1.7 0.15 1.6 1.3 0.8 No 3/19/09 B WC-R-B06 1.3 0.9 0.15 1.0 0.9 0.7 No 3/19/09 B WC-R-B08 0.9 0.7 0.12 1.5 0.9 0.8 No 3/19/09 C WC-R-C07 2.4 x 1.4 x 0.10 overall No 3/19/09 C WC-R-C08 1.3 0.8 0.1 1.0 0.9 0.6 No 3/19/09 C WC-R-C09 1.4 1.0 0.2 1.6 0.7 0.4 No 3/19/09 C WC-R-C10 1.0 1.0 0.15 2.6 1.0 0.5 No 3/19/09 C WC-R-C11 1.0 0.9 0.2 0.8 1.0 0.6 No 3/19/09 C WC-R-C12 1.0 0.9 0.1 2.2 0.8 0.4 No UNKNOWN 1/23/09 B WC-R-B02 1.5 1.2 0.1 1.0 1.0 0.5 No 3/19/09 B WC-R-B07 1.8 2.2 0.13 5.7 2.2 1.6 No 47
Table 8. Fish observations from 2009/2010 Walker Creek spawner surveys. Date Reach Observation # Certainty of spp ID* Live or Carcass Sex Certainty Fish on Redd? of sex ID* no/yes (redd #) COHO SALMON no adult coho observed (live fish or carcasses) STEELHEAD 1/8/10 C WC-F-C01 1 live?? no 2/19/10 B WC-F-B01 1 live F 1 yes (WC-R-B09) 2/19/10 B WC-F-B02 1 live M 1 yes (WC-R-B09) 2/19/10 B WC-F-B03 1 live?? no UNKOWN no unknown salmonids observed (live fish or carcasses) *Certainty of species/sex ID: 1= sure (distinguishing characteristics confirmed) 2= may be one species or another (not all characteristics seen) 3= unknown Table 9. Redd observations from 2009/2010 Walker Creek spawner surveys. Date Reach Redd # Pit Dimensions Tail Spill Dimensions Fish on Redd? L (m) W (m) D (m) L (m) W1 (m) W2 (m) yes/no COHO SALMON 12/17/09 B WC-R-B01 6.9 x 2.5 x 0.25 overall No 12/17/09 B WC-R-B02 3.5 x 2.1 x 0.15 overall No STEELHEAD 2/19/10 B WC-R-B03 4.0 x 2.1 x 0.1 overall No 2/19/10 B WC-R-B04 4.2 x 1.5 x 0.15 overall No 2/19/10 B WC-R-B05 3.9 x 2.4 x 0.15 overall No 2/19/10 B WC-R-B06 2.2 x 0.9 x 0.2 overall No 2/19/10 B WC-R-B07 3.8 x 1.3 x 0.17 overall No 2/19/10 B WC-R-B08 3.0 x 1.2 x 0.25 overall No 2/19/10 B WC-R-B09 No Data yes (WC-F-B01/02) 2/19/10 C WC-R-C02 2.0 x 1.2 x 0.15 overall No 2/19/10 C WC-R-C03 2.4 x 1.1 x 0.2 overall No 2/19/10 C WC-R-C04 1.4 x 1.0 x 0.15 overall No 2/19/10 C WC-R-C05 1.8 x 1.0 x 0.05 overall No 2/19/10 C WC-R-C06 2.0 x 0.9 x 0.2 overall No UNKOWN 1/8/10 C WC-R-C01 3.1 x 1.1 x 0.3 overall No 48
Table 10. Fish present in each pool where juvenile coho salmon were observed during 2007 Walker Creek snorkel surveys (August/September 2007). Pool Number Drainage Coho Steelhead Roach Stickleback Sculpin 1 Walker Creek 2 30 100 40 2 2 Walker Creek 2 NA NA NA NA 3 Frink Canyon 9 3 0 0 0 4 Frink Canyon 12 4 0 0 0 5 Walker Creek 3 15 0 0 0 6 Walker Creek 1 6 15 0 0 7 Walker Creek 1 17 20 0 0 8 Walker Creek 1 54 2 0 0 9 Walker Creek 1 59 37 0 0 10 Walker Creek 1 25 35 4 0 11 Walker Creek 3 27 31 0 0 12 Walker Creek 1 15 55 0 0 13 Walker Creek 4 35 250 0 0 14 Walker Creek 3 30 50 0 0 15 Walker Creek 2 31 25 3 0 16 Walker Creek 10 64 45 0 1 17 Walker Creek 1 61 15 0 0 18 Walker Creek 2 80 10 0 0 19 Walker Creek 2 28 5 0 0 20 Walker Creek 16 62 22 0 0 21 Walker Creek 6 17 12 0 0 22 Walker Creek 2 25 13 0 0 23 Walker Creek 8 45 50 0 0 24 Walker Creek 13 13 15 0 1 25 Walker Creek 2 4 5 0 0 26 Walker Creek 2 8 3 0 1 27 Walker Creek 4 15 7 0 0 28 Walker Creek 3 18 8 0 0 29 Walker Creek 2 11 0 0 0 30 Walker Creek 11 90 100 0 0 31 Walker Creek 2 37 2 0 0 32 Walker Creek 29 20 90 0 0 33 Walker Creek 17 14 30 0 0 34 Walker Creek 1 15 19 0 0 35 Walker Creek 1 26 3 0 0 36 Walker Creek 1 67 0 0 1 37 Walker Creek 3 72 21 0 0 38 Walker Creek 3 15 75 2 0 39 Walker Creek 1 26 35 0 0 40 Salmon Creek 5 25 90 30 0 TOTAL 193 1,209 1,295 79 6 49
Table 11. Summary of data from 2007 Walker Creek electrofishing surveys (coho salmon and steelhead only). E-Fishing Survey Area Drainage Date Surveyed # Fish Collected Coho Size Range (mm FL) # Fish Collected Steelhead Size Range (mm FL) 1 Walker Creek 9/14/2007 3 83-90 25 52-96 2 Frink Canyon 9/14/2007 6 44-59 5 95-117 3 Walker Creek 9/14/2007 1 76 23 65-104 4 Walker Creek 10/30/2007 4 74-86 73 62-206 5 Salmon Creek 10/30/2007 3 76-80 46 52-166 TOTAL 17 44-90 172 52-206 Table 12. Fish present in each pool where juvenile coho salmon were observed during 2008 Walker Creek snorkel surveys (August 2008). Pool Number Drainage Coho Steelhead Roach Stickleback Sculpin 1 Walker Creek 1 75 0 0 0 2 Walker Creek 2 68 10 0 0 3 Walker Creek 1 30 0 0 0 4 Walker Creek 1 37 41 0 0 5 Walker Creek 1 29 16 0 0 6 Walker Creek 1 22 70 2 0 7 Walker Creek 1 81 70 0 0 8 Walker Creek 1 52 65 0 0 9 Walker Creek 2 13 8 0 0 10 Walker Creek 2 16 0 0 0 11 Walker Creek 2 40 120 0 0 12 Walker Creek 2 126 90 0 0 13 Frink Canyon 1 3 0 0 0 14 Frink Canyon 1 10 0 0 0 TOTAL 19 599 490 2 0 50
Table 13. Summary of data from 2008 Walker Creek electrofishing surveys (coho salmon and steelhead only). E-Fishing Survey Area Drainage Date Surveyed # Fish Collected Coho Size Range (mm FL) # Fish Collected Steelhead Size Range (mm FL) 1 Walker Creek 10/27/2008 1 95 180 53-203 TOTAL 1 95 180 52-203 Table 14. Summary of data from fall 2007 BMI sampling in Walker Creek, conducted by staff and students at Walker Creek Ranch. BMI Sample Information Collection Location Alder Flats Sandy Flats Alder Flats Sandy flats Date 10/2/07 11/8/07 11/15/07 11/29/07 # Kick Samples? 3 16 4 # Sorters? 18 14 19 Sorting time? 20 min? 230(?) Water Quality/Site Conditions Water Temp.? 15 ºC 12 ºC 52 ºF ph?? 8.5 7 DO?? 37 ppm 44 ppm Turbidity? clear clear clear Weather? cloudy/cold sunny/clear sunny/cold Flow? low normal normal Organisms Identified BMI Taxa # indiv. sizes # indiv. sizes # indiv. sizes # indiv. sizes Mayflies 1? 14 s-m 3 s 31 s Stoneflies 2? 11 s-l 0 4 m-xl Caddisflies 1? 7 m-l 43 m 29 s True Flies 1? 0 7 s 14 s-l Beetles 1? 3 s-m 3 s-xl 0? True Bugs 0? 25 m-l 21 m-xl 0? Dragonflies 0? 0? 2 m 0? Damselflies 0? 2 s 3 s-l 0? Mites 0? 0? 2 s 0? Amphipods 0? 0? 0? 4? Isopods 0? 4 s 2 s 0? Snails 0? 7 s-m 1 s 0? Oligochaetes 0? 1 s 0? 1? 51
Table 15. Summary of data from January 2009 BMI sampling in Walker Creek, conducted by GANDA. BMI Sample Information Collection Location Alder Flats Sandy Flats Alder Flats Sandy flats Date 1/21/09 1/21/09 1/21/09 1/21/09 # Kick Samples 1 1 1 4 Organisms Identified BMI Taxa # indiv # indiv # indiv # indiv Mayflies 180 130 155 82 Stoneflies 11 6 21 6 Caddisflies 155 66 106 60 True Flies 141 285 186 270 Beetles 41 34 58 23 True Bugs 0 0 0 0 Dragonflies 0 0 0 0 Damselflies 1 1 1 0 Mites 4 8 3 7 Amphipods 0 0 0 3 Isopods 0 0 0 0 Snails 1 0 3 3 Oligochaetes 0 11 8 49 Table 16. Yearly maximum streamflow data for Walker Creek over the past 11years (USGS Gage 11460750; source: USGS 2010). Winter Season Date Max. Mean Daily Discharge (cfs) Instantaneous Peak Discharge (cfs) 1997/1998 2/3/1998 4,230 10,500 1998/1999 2/7/1999 2,240 3,950 1999/2000 2/14/2000 981 1,410 2000/2001 2/24/2001 150 237 2001/2002 1/2/2002 945 1,230 2002/2003 12/16/2002 597 2,190 2003/2004 1/1/2004 794 1,690 2004/2005 3/22/2005 647 959 2005/2006 12/31/2005 4,130 7,760 2006/2007 2/10/2007 256 533 (12/26/06) 2007/2008 2/3/2008 574 1,310 (1/26/08) 2008/2009 2/22/2009 251 n/d 2009/2010 1/20/2010 469* 1,690* * Provisional data. 52
Mandy s Pool on mainstem Walker Creek Walker Creek Ranch entrance 53