Goodwin

Stanislaus River Snorkel Survey Update (Aug, 2006) (Draft Data Not for Citation) Introduction Snorkel surveys were conducted on the lower Stanislaus River from January 2005 to August 2006 to determine the distribution, abundance, and habitat use patterns of juvenile Chinook salmon and rainbow trout. Juvenile Chinook Salmon were abundant in spring and early summer of 2005 with observed numbers decreasing in late summer and fall of the same year. In February through June of 2006 flows on the Stanislaus river were greater than 3000cfs and at times exceeded 6,000 cfs which made snorkel surveys impossible to conduct for safety and turbidity reasons. Surveys resumed June 9, 2006 when flows receded to 1,500 cfs. By this time, we assume that a great number of juvenile Chinook had already migrated out of the river during the high spring flows (compared to the same time period in 2005). Observed chinook densities were highest in June when surveys commenced and have gradually decreased throughout the summer of 2006. Juvenile and adult trout were observed throughout the survey period with peak numbers observed in the fall and winter of 2005. The following report briefly summarizes salmonid densities and distribution for the survey period. Goodwin Juvenile Chinook Salmon Chinook densities were consistently higher in experimental gravel introduction sites relative to slow and fast water sites. Higher density in gravel introduction areas of fry may simply be related to proximity to spawning areas. Densities peaked in March and April of 2005 with max densities of 32 fish/100m2. In spring of 2006 river discharge reached over 6000 cfs which prohibited crews from documenting emergence and early densities and distribution throughout the river. When surveys were conducted in early June, Chinook densities were relatively low (<1/100m2) as compared to June of 2005 (110/100m2) and continue to decline as the summer progresses. Age 0+ Trout YOY trout were first observed in mid April of 2005. 0+ trout remained abundant through the spring and summer of both years, and through the fall, as well. Generally, slow water sites had higher densities than gravel addition and fast water sites in 2005 and 2006. It should be noted that the “slow water” site in the Goodwin reach has changed due to lateral gravel recruitment from upstream additions. The depth of the site has been reduced considerably and higher velocities have resulted. Future surveys of slow water habitats will be moved upstream to the float tube pool. Age 1+ Trout Age 1 and older trout were present year-round in both survey years. Densities were consistently high in the slow water site with peak densities in the winter of 2005. Densities were lowest in the early spring of 2005. Fish/100m2 2/ 10.0 15.0 20.0 25.0 30.0 35.0 0.0 5.0 Survey Date 0 2 4 Goodwin Chinook 13 3/ /20 11 05 4/ /20 12 05 4/ /20 27 05 5/ /20 16 05 /2 6/ 00 3/ 5 6/ 20 22 05 7/ /20 15 05 7/ /20 28 05 / 8/ 200 4 5 8/ /20 10 05 8/ /20 18 05 8/ /20 26 05 / 9/ 200 6/ 5 9/ 20 21 05 10 /20 / 0 10 7/2 5 /2 00 7 5 11 /20 /9 05 12 /20 /7 05 2/ /20 17 05 / 6/ 200 9 6 6/ /20 15 06 6/ /20 27 06 / 7/ 200 5/ 6 7/ 20 13 06 / 8/ 200 3/ 6 20 06 6 8 10 12 14 16 Temperature Fast Slow Exp. 1 Exp. 2 Temperature Fish/100m2 2/ 10.0 12.0 14.0 16.0 18.0 0.0 2.0 4.0 6.0 8.0 Survey Date 0 2 4 Goodwin Trout 0+ 13 3/ /20 11 05 4/ /20 12 05 4/ /20 27 05 5/ /20 16 05 /2 6/ 00 3/ 5 6/ 20 22 05 7/ /20 15 05 7/ /20 28 05 / 8/ 200 4/ 5 8/ 20 10 05 8/ /20 18 05 8/ /20 26 05 /2 9/ 00 6/ 5 9/ 20 21 05 10 /20 / 0 10 7/2 5 /2 00 7 5 11 /20 /9 05 12 /20 /7 05 2/ /20 17 05 / 6/ 200 9 6 6/ /20 15 06 6/ /20 27 06 /2 7/ 00 5/ 6 7/ 20 13 06 / 8/ 200 3/ 6 20 06 6 8 10 12 14 16 Temperature Fast Slow Exp. 1 Exp. 2 Temperature Fish/100m2 10 12 0 2 4 6 8 Survey Date 0 2 4 Goodwin Trout 1+ 2/ 1 3/ 3/2 1 0 4/ 1/2 05 1 0 4/ 2/2 05 2 0 5/ 7/2 05 16 0 0 6/ /20 5 6/ 3/2 05 2 0 7/ 2/2 0 5 1 0 7/ 5/2 05 28 0 0 8/ /20 5 8/ 4/2 05 1 0 8/ 0/2 0 5 1 0 8/ 8/2 05 26 0 0 9/ /20 5 9/ 6/2 05 2 0 10 1/2 0 5 10 /7/ 0 05 /2 20 11 7 /2 05 0 12 /9/2 05 / 0 2/ 7/2 05 17 0 0 6/ /20 5 6/ 9/2 06 1 0 6/ 5/2 0 6 27 0 0 7/ /20 6 7/ 5/2 06 13 00 8/ /20 6 3/ 06 20 06 Temperature 6 Exp. 2 Temperature 8 Slow Exp. 1 10 Fast 12 14 16 Two-Mile Bar Juvenile Chinook Salmon Peak Chinook densities were in gravel introduction and fast water sites in mid March 2005 and generally highest in fast water sites in 2006. As overall densities declined in spring and salmon grew to fingerling and smolt sizes, densities were highest in gravel introduction and fast water sites. In 2006 peak densities were observed in early June in the fast water site. Age 0+ Trout Age 0+ trout first appeared in abundance in June 2005. They were observed throughout the year 2005 and in the summer of 2006 with the greatest densities observed at gravel introduction and fast water sites. Age 1+ Trout Age 1 and older trout were relatively abundant year-round with highest densities from early August through late October in the fast water sites. Highest densities were observed at gravel introduction sites. Fish/100m2 3/ 10.0 15.0 20.0 25.0 30.0 35.0 40.0 45.0 11 / 0.0 5.0 Survey Date 0 2 4 6 2-Mile Bar Chinook 4/ 200 12 5 /2 6/ 005 3/ 6/ 200 21 5 / 7/ 200 15 5 / 7/ 200 28 5 /2 8/ 005 4/ 8/ 200 10 5 / 8/ 200 19 5 /2 9/ 005 6/ 9/ 200 21 5 / 10 200 /7 5 10 /20 /2 05 7 11 /20 /2 05 1 12 /20 /1 05 5/ 2/ 200 20 5 /2 6/ 006 9/ 6/ 200 15 6 / 6/ 200 27 6 /2 7/ 006 5/ 7/ 200 13 6 /2 8/ 006 3/ 20 06 8 Fast Slow Exp. 1 Temperature 10 12 14 16 Temperature Fish/100m2 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 Survey Date 0 2 4 2 Mile Bar 0+ Trout 3/ 11 / 4/ 200 12 5 /2 6/ 005 3/ 6/ 200 21 5 / 7/ 200 15 5 / 7/ 200 28 5 /2 8/ 005 4/ 8/ 200 10 5 / 8/ 200 19 5 /2 9/ 005 6/ 9/ 200 21 5 / 10 200 /7 5 10 /20 /2 05 7 11 /20 /2 05 1 12 /20 /1 05 5/ 2/ 200 20 5 /2 6/ 006 9/ 6/ 200 15 6 / 6/ 200 27 6 /2 7/ 006 5/ 7/ 200 13 6 /2 8/ 006 3/ 20 06 6 8 Fast Slow Exp. 1 Temperature 10 12 14 16 Temperature Fish/100m2 3/ 11 / 0.5 1.5 2.5 3.5 0 1 2 3 Survey Date 0 2 4 2 Mile Bar Trout 1+ 4/ 200 12 5 /2 6/ 005 3/ 6/ 200 21 5 / 7/ 200 15 5 / 7/ 200 28 5 /2 8/ 005 4/ 8/ 200 10 5 / 8/ 200 19 5 /2 9/ 005 6/ 9/ 200 21 5 / 10 200 /7 5 10 /20 /2 05 7 11 /20 /2 05 1 12 /20 /1 05 5/ 2/ 200 20 5 /2 6/ 006 9/ 6/ 200 15 6 / 6/ 200 27 6 /2 7/ 006 5/ 7/ 200 13 6 /2 8/ 006 3/ 20 06 6 8 Fast Slow Exp. 1 Temperature 10 12 14 16 Temperature Knights Ferry Juvenile Chinook Salmon Peak Chinook densities were highest in gravel and fast water sites from early March to late April and in experimental and slow water sites through mid June of 2005. Overall densities declined by mid June in both years. Age 0+ Trout Age 0 trout first appeared in March of 2005 with peak densities in September of 2005 and June of 2006. In 2005, densities were consistently higher in gravel introduction sites but shifted to fast water sites in 2006. Overall, young of the year trout were observed in higher densities in 2006 relative to 2005. Age 1+ Trout Age 1 and older trout were observed in significantly lower numbers at Knights Ferry than at upstream sites in both 2005 and 2006. Observed densities peaked in the in November of 2005 and in June of 2006. Fish/100m2 3/ 10 15 20 25 30 35 40 0 5 Survey Date 0 2 4 Knights Ferry Chinook 11 4/ /20 12 0 5 4/ /20 27 0 / 5 6/ 200 3/ 5 6/ 20 23 0 5 7/ /20 15 0 5 7/ /20 28 0 / 5 8/ 200 3 5 8/ /20 11 0 5 8/ /20 18 0 5 8/ /20 25 0 / 5 9/ 200 7 5 9/ /20 20 0 5 10 /20 /6 05 10 /2 /2 00 8 5 11 /20 /9 05 11 /2 /2 00 1 5 12 /20 /5 05 12 /2 /1 00 5 5 2/ /20 17 0 5 5/ /20 17 0 / 6 6/ 200 8 6 6/ /20 15 0 6 6/ /20 22 0 / 6 7/ 200 6 6 7/ /20 12 0 / 6 8/ 200 3/ 6 20 06 6 8 Fast Slow Exp. 1 Temperature 10 12 14 16 Temperature Fish/100m2 0 1 2 3 4 5 6 7 Knights Ferry Trout 0+ Survey Date 0 2 4 6 Temperature 3/ 1 4/ 1/2 1 4/ 2/20 05 27 0 6/ /20 05 6/ 3/2 05 2 7/ 3/200 5 1 7/ 5/20 05 28 0 8/ /20 05 8/ 3/2 05 1 0 8/ 1/2 0 5 1 8/ 8/20 05 25 0 9/ /20 05 9/ 7/2 05 2 0 10 0/2 0 5 10 /6/ 0 0 /2 2 5 11 8 /20 05 11 /9/ 00 /2 2 5 12 1 /20 05 12 /5/ 00 /1 20 5 2/ 5 /2 05 1 5/ 7/2 005 17 0 6/ /20 06 6/ 8/2 06 1 6/ 5/200 6 22 0 7/ /20 06 7/ 6/2 06 12 0 8/ /200 6 3/ 0 20 6 06 Temperature 8 Slow Exp. 1 10 Fast 12 14 16 Fish/100m2 3/ 0.2 1 2 0.4 0.6 0.8 1.2 1.4 1.6 1.8 0 Survey Date 0 2 4 Knights Ferry Trout 1+ 11 4/ /20 12 0 5 4/ /20 27 0 / 5 6/ 200 3/ 5 6/ 20 23 0 5 7/ /20 15 0 5 7/ /20 28 0 / 5 8/ 200 3 5 8/ /20 11 0 5 8/ /20 18 0 5 8/ /20 25 0 / 5 9/ 200 7 5 9/ /20 20 0 5 10 /20 /6 05 10 /2 /2 00 8 5 11 /20 /9 05 11 /2 /2 00 1 5 12 /20 /5 05 12 /2 /1 00 5 5 2/ /20 17 0 5 5/ /20 17 0 / 6 6/ 200 8 6 6/ /20 15 0 6 6/ /20 22 0 / 6 7/ 200 6 6 7/ /20 12 0 / 6 8/ 200 3/ 6 20 06 6 8 10 12 14 16 Temperature Fast Slow Exp. 1 Temperature Lovers Leap Juvenile Chinook Salmon Chinook densities were highest in fast water sites from early March through June 2005 and from early February to June 2006. Densities were high in gravel introduction sites in 2005, in 2006 densities in this same site were much lower. The slow water site for both years was reasonably consistent. Age 0 Trout Age 0 trout first appeared in March of 2005 with peak densities observed in June-July of 2005 and 2006. Distribution shifted from gravel introduction sites in 2005 to fast water sites in late 2006. Overall densities were higher in 2006 relative to 2005. Age 1+ Trout Age 1 and older trout were observed throughout the survey period. Peak densities were observed in July and December of 2005 and in June of 2006. Distribution was skewed toward gravel introduction sites in 2005 and shifted to fast water sites in 2006. Fish/100m2 3/ 10 15 20 25 30 35 0 5 Lovers Leap Chinook Survey Date 0 2 4 12 4/ /20 12 05 /2 6/ 00 2/ 5 6/ 20 22 05 7/ /20 14 05 7/ /20 28 05 /2 8/ 00 3/ 5 8/ 20 10 05 8/ /20 18 05 8/ /20 25 05 /2 9/ 00 7 5 9/ /20 20 05 10 /20 / 0 10 6/2 5 /2 00 11 7/2 5 /1 00 1 5 12 /20 / 0 12 5/2 5 /1 00 5 5 2/ /20 16 05 5/ /20 17 06 /2 6/ 00 9/ 6 6/ 20 16 06 6/ /20 22 06 /2 7/ 00 5 6 7/ /20 12 06 /2 8/ 00 3/ 6 20 06 6 8 Fast Slow Exp Temp 10 12 14 16 Temperature Fish/100m2 3/ 0 1 2 3 4 5 6 7 Lovers Leap Trout 0+ Survey Date 0 2 4 12 / 4/ 200 12 5 /2 6/ 005 2/ 6/ 200 22 5 / 7/ 200 14 5 / 7/ 200 28 5 /2 8/ 005 3/ 8/ 200 10 5 / 8/ 200 18 5 / 8/ 200 25 5 /2 9/ 005 7/ 9/ 200 20 5 / 10 200 /6 5 10 /20 /2 05 7 11 /20 /1 05 1/ 12 200 /5 5 12 /20 /1 05 5/ 2/ 200 16 5 / 5/ 200 17 6 /2 6/ 006 9/ 6/ 200 16 6 / 6/ 200 22 6 /2 7/ 006 5/ 7/ 200 12 6 /2 8/ 006 3/ 20 06 6 8 10 12 14 16 Temperature Fast Slow Exp Temp Fish/100m2 0.5 1.5 2.5 0 1 2 Lovers Leap Trout 1+ Survey Date 0 2 4 3/ 12 / 4/ 200 12 5 /2 6/ 005 2/ 6/ 200 22 5 / 7/ 200 14 5 / 7/ 200 28 5 /2 8/ 005 3/ 8/ 200 10 5 / 8/ 200 18 5 / 8/ 200 25 5 /2 9/ 005 7/ 9/ 200 20 5 / 10 200 /6 5 10 /20 /2 05 7 11 /20 /1 05 1/ 12 200 /5 5 12 /20 /1 05 5/ 2/ 200 16 5 / 5/ 200 17 6 /2 6/ 006 9/ 6/ 200 16 6 / 6/ 200 22 6 /2 7/ 006 5/ 7/ 200 12 6 /2 8/ 006 3/ 20 06 6 8 10 12 14 16 Temperature Fast Slow Exp Temp Honolulu Bar Juvenile Chinook Salmon Chinook densities were highest in mid April 2005 and in June 2006. Densities were highest in the slow site in 2005, while in 2006 densities were highest in the fast water site. Age 0+ Trout Age 0+ trout first appeared in April of 2005 and in Feb of 2006. Peak densities occurred in June of 2005 and 2006. Densities were higher in gravel addition sites in 2005 and fast water sites in 2006. Overall densities were higher in 2006 relative to 2005. Age 1+ Trout Age 1 and older trout were observed throughout of the two survey periods, with highest observed densities in November of 2005 and June of 2006. Densities were significantly higher in gravel introduction and fast water sites than slow water sites. Fish/100m2 4/ 13 / 10 15 20 25 30 0 5 6/ Survey Date 0 2 4 Honolulu Chinook 20 0 2/ 5 20 6/ 22 05 /2 7/ 00 13 5 /2 7/ 00 29 5 /2 0 8/ 05 3/ 2 8/ 00 10 5 /2 8/ 00 19 5 /2 8/ 00 25 5 /2 0 9/ 05 6/ 2 9/ 00 20 5 /2 10 00 /6 5 10 /20 /2 05 8 11 /20 /1 05 1 11 /20 /2 05 1/ 2 12 00 /5 5 /2 2/ 00 16 5 /2 0 6/ 06 8/ 2 6/ 00 16 6 /2 6/ 00 26 6 /2 0 7/ 06 5/ 2 7/ 00 13 6 /2 0 8/ 06 3/ 20 06 6 8 10 12 14 16 18 Temperature Fast Slow Exp Temp Fish/100m2 0 1 2 3 4 5 6 7 8 Survey Date 0 2 4 Honolulu Trout 0+ 4/ 13 /2 0 6/ 05 2/ 2 6/ 00 22 5 /2 7/ 00 13 5 /2 7/ 00 29 5 /2 0 8/ 05 3/ 2 8/ 00 10 5 /2 8/ 00 19 5 /2 8/ 00 25 5 /2 0 9/ 05 6/ 2 9/ 00 20 5 /2 10 00 /6 5 10 /20 /2 05 8 11 /20 /1 05 1 11 /20 /2 05 1/ 2 12 00 /5 5 /2 2/ 00 16 5 /2 0 6/ 06 8/ 6/ 200 16 6 /2 6/ 00 26 6 /2 0 7/ 06 5/ 2 7/ 00 13 6 /2 0 8/ 06 3/ 20 06 6 8 10 12 14 16 18 Temperature Fast Slow Exp Temp Fish/100m2 4/ 13 / 0.2 0.4 0.6 0.8 1.2 0 1 6/ Honolulu Trout 1+ Survey Date 0 2 4 20 0 2/ 5 20 6/ 22 05 /2 7/ 00 13 5 /2 7/ 00 29 5 /2 0 8/ 05 3/ 2 8/ 00 10 5 /2 8/ 00 19 5 /2 8/ 00 25 5 /2 0 9/ 05 6/ 2 9/ 00 20 5 /2 10 00 /6 5 10 /20 /2 05 8 11 /20 /1 05 1 11 /20 /2 05 1/ 2 12 00 /5 5 /2 2/ 00 16 5 /2 0 6/ 06 8/ 2 6/ 00 16 6 /2 6/ 00 26 6 /2 0 7/ 06 5/ 2 7/ 00 13 6 /2 0 8/ 06 3/ 20 06 6 8 10 12 14 16 18 Temperature Fast Slow Exp Temp Orange Blossom Chinook Salmon Chinook fry first appeared in March of 2005 and in February of 2006. Chinook densities were highest mid March 2005 and in early June 2006. Densities declined sharply in late June of both years. Age 0+ Trout Age 0 trout first appeared in March of 2005 and February of 2006. Peak densities were observed in June and July of both years. Densities were significantly higher at the gravel introduction site during summer and fall of 2005 and in fast water site in the summer of 2006. Overall densities were higher in 2006 relative to 2005. Age 1+ Trout Age 1 and older trout were observed sporadically and in low numbers through both 2005 and 2006 at Orange Blossom. Yearling densities were significantly higher at the gravel introduction site. Fish/100m2 10 20 30 40 50 60 0 Orange Blossom Chinook Survey Date 0 2 4 6 03 /1 4/ 2/0 12 5 /2 6/ 005 2/ 6/ 200 21 5 / 7/ 200 14 5 / 7/ 200 29 5 /2 8/ 005 2/ 8/ 200 11 5 / 8/ 200 19 5 /2 9/ 005 7/ 9/ 200 20 5 / 10 200 /6 5 10 /20 /2 05 8/ 2 11 005 /1 1 11 /05 /2 12 1/0 /5 5 / 2/ 200 16 5 /2 6/ 006 8/ 6/ 200 15 6 / 6/ 200 27 6 /2 7/ 006 6/ 7/ 200 12 6 /2 8/ 006 3/ 20 06 8 10 12 14 16 18 Temperature Fast Slow Exp Temp Fish/100m2 0 1 2 3 4 5 6 7 8 Orange Blossom Trout 0+ Survey Date 0 2 4 03 /1 4/ 2/0 12 5 /2 0 6/ 05 2/ 2 6/ 00 21 5 /2 7/ 00 14 5 /2 7/ 00 29 5 /2 0 8/ 05 2/ 2 8/ 00 11 5 /2 8/ 00 19 5 /2 0 9/ 05 7/ 2 9/ 00 20 5 /2 10 00 /6 5 10 /20 /2 05 8/ 20 11 05 /1 1 11 /05 /2 12 1/0 /5 5 /2 2/ 00 16 5 /2 0 6/ 06 8/ 2 6/ 00 15 6 /2 6/ 00 27 6 /2 0 7/ 06 6/ 2 7/ 00 12 6 /2 0 8/ 06 3/ 20 06 6 8 10 12 14 16 18 Temperature Fast Slow Exp Temp Fish/100m2 0.2 0.4 0.6 0.8 1.2 0 1 Orange Blossom Trout 1+ Survey Date 0 2 4 03 /1 4/ 2/0 12 5 /2 6/ 005 2/ 6/ 200 21 5 / 7/ 200 14 5 / 7/ 200 29 5 /2 8/ 005 2/ 8/ 200 11 5 / 8/ 200 19 5 /2 9/ 005 7/ 9/ 200 20 5 / 10 200 /6 5 10 /20 /2 05 8/ 2 11 005 /1 1 11 /05 /2 12 1/0 /5 5 / 2/ 200 16 5 /2 6/ 006 8/ 6/ 200 15 6 / 6/ 200 27 6 /2 7/ 006 6/ 7/ 200 12 6 /2 8/ 006 3/ 20 06 6 8 10 12 14 16 18 Temperature Fast Slow Exp Temp Valley Oak Juvenile Chinook Salmon Chinook were first observed in February of both years. Chinook densities were highest in the gravel introduction site in 2005 and in the slow site in 2006. Age 0+ Trout Age 0+ trout were first observed in June of both years. Distribution within the reach was centered on the gravel restoration site in 2005 but shifted toward fast and slow water sites in 2006. Age 1+ Trout Age 1 and older trout were rarely observed during both survey years. Valley Oak Chinook 14 12 10 12 10 8 6 6 4 2 0 4 2 0 Temperature Fish/100m2 8 Fast Slow Exp Temp 2/ 11 /2 00 5 6/ 2/ 20 05 6/ 22 /2 00 5 2/ 20 /2 00 6 6/ 8/ 20 06 6/ 15 /2 00 6 7/ 6/ 20 06 7/ 12 /2 00 6 Survey Date Valley Oak Trout 0+ 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 12 10 8 6 4 2 0 Temperature Fish/100m2 Fast Slow Exp Temp 20 05 20 05 20 06 20 06 2/ 20 05 8/ 20 06 11 / 22 / 20 / 15 / 6/ 20 06 7/ 6/ 2/ 6/ 2/ 6/ 6/ Survey Date Valley Oak Trout 1+ 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 12 10 7/ 12 / 20 06 Temperature Fish/100m2 8 6 4 2 0 Fast Slow Exp Temp 20 05 20 05 20 06 20 06 2/ 20 05 8/ 20 06 2/ 11 / 6/ 22 / 2/ 20 / 6/ 15 / 6/ 20 06 7/ Survey Date 7/ 12 / 6/ 6/ 20 06 Oakdale Juvenile Chinook Salmon Peak Densities of Chinook were observed in June of 2005 and February 2006 in both fast and slow water sites. Visibility at the site made observations difficult throughout most of the survey period. Age 0+ Trout Very few age 0 trout were observed in either year. Age 1+ Trout Very few age 1+ or older trout were observed in either year. Oakdale Rec Chinook 20 18 12 16 14 10 8 6 4 2 2 0 2/11/2005 6/2/2005 6/22/2005 2/20/2006 Survey Date 0 14 12 10 8 6 4 Temperature Fish/100m2 Fast Slow temp Oakdale Rec Steelhead 0+ 0.18 0.16 0.14 14 12 10 Temperature Fish/100m2 0.12 0.1 0.08 0.06 0.04 0.02 0 2/11/2005 6/2/2005 6/22/2005 2/20/2006 Survey Date 8 6 4 2 0 Fast Slow temp Oakdale Rec Trout 1+ 0.06 0.05 0.04 8 0.03 6 0.02 4 0.01 0 2/11/2005 6/2/2005 6/22/2005 2/20/2006 Survey Date 2 0 14 12 10 Temperature Fish/100m2 Fast Slow temp Stream Flows Flows at Orange Blossom Bridge in the 2005 survey period, January 1, 2005 through December 23, 2005, ranged from 209 to 1,517 cfs. Spring–time flows ranged from 1,067 to 1,435 cfs during April 30 to June 2. These spring high flows correspond to reservoir releases generally referred to as the Vernalis Adaptive Management Program (VAMP) releases, which vary depending on the water year type. VAMP releases generally occur from mid-April to mid-May, or in some years early April to late May. VAMP releases are generally 1200-1500 cfs. Summer releases above 300 cfs are generally for meeting Vernalis flow standards or Ripon dissolved oxygen standards. By mid-August flows had declined to near 300 cfs and remained in this range for the remainder of the summer through the winter. Non-VAMP reservoir releases are generally in the 250-300 cfs range, except when higher releases are needed for water quality. Flows at Orange Blossom Bridge in the 2006 survey period, December 23, 2005 through June 28 2006, ranged from 481 to 6,524 cfs. Spring-time high flows prevented surveys on the river from mid February to mid June when flows dropped below 2,000 cfs. cfs 1000 2000 3000 4000 5000 6000 7000 0 1/1/2005 2/1/2005 3/1/2005 4/1/2005 5/1/2005 6/1/2005 7/1/2005 8/1/2005 9/1/2005 10/1/2005 11/1/2005 12/1/2005 1/1/2006 2/1/2006 3/1/2006 4/1/2006 5/1/2006 6/1/2006 7/1/2006 8/1/2006 River Discharge 2005-2006