<strong>Feasibility</strong> <strong>of</strong> <strong>Fish</strong> <strong>Passage</strong> <strong>at</strong> <strong>Alameda</strong> <strong>Creek</strong> <strong>Diversion</strong> <strong>Dam</strong>Table 5-4ACDD <strong>Fish</strong> <strong>Passage</strong> Options and Conceptual Annualized Cost ComparisonOptionsLong <strong>Fish</strong>way($1,032,000)Design Components (with annualized cost)Confluence<strong>Fish</strong> Facility($185,000)CampOhloneHaul Route($483,000)<strong>Fish</strong> Screen($3,310,000)AnnualizedOption CostACDD <strong>Fish</strong> Ladder X X $4,342,000Ohlone Trap and Haul X X X $3,978,000The annualized cost <strong>of</strong> the ACDD <strong>Fish</strong> Ladder option is comparable to the Ohlone Trap and Hauloption, based on the conceptual analysis carried out for this technical memorandum. Each option isretained for further evalu<strong>at</strong>ion to determine which is more suitable <strong>at</strong> ACDD.ACDD <strong>Passage</strong> June 2009 Page 5-12
6.0 Additional Consider<strong>at</strong>ions and Analysis6 ADDITIONAL CONSIDERATIONS AND ANALYSISThis section provides a discussion <strong>of</strong> additional factors, beyond the preliminary analysis in Section 4and the cost analysis in Section 5, th<strong>at</strong> warrant consider<strong>at</strong>ion when evalu<strong>at</strong>ing design components <strong>at</strong> aconceptual level. These include estim<strong>at</strong>es <strong>of</strong> the amount <strong>of</strong> habit<strong>at</strong> th<strong>at</strong> the design components couldprovide access to, the potential for the design components to sustain a popul<strong>at</strong>ion <strong>of</strong> steelhead, andthe other environmental consider<strong>at</strong>ions rel<strong>at</strong>ed to fish passage. Inform<strong>at</strong>ion from this section issubsequently used in Section 7, where the biological benefit <strong>of</strong> passage is analyzed.6.1 HABITAT AVAILABILITYA key consider<strong>at</strong>ion in assessing the opportunity for cre<strong>at</strong>ing passage <strong>at</strong> ACDD for future steelhead isunderstanding habit<strong>at</strong> conditions upstream <strong>of</strong> ACDD. Detailed d<strong>at</strong>a regarding habit<strong>at</strong> conditions forO. mykiss in the Upper <strong>Alameda</strong> <strong>Creek</strong> Basin are limited and completion <strong>of</strong> habit<strong>at</strong> surveys was not withinthe scope <strong>of</strong> work for this conceptual feasibility analysis. This section summarizes inform<strong>at</strong>ion fromavailable liter<strong>at</strong>ure and knowledgeable experts.The SFPUC’s property extends only 1.5 miles upstream from ACDD. If passage was provided <strong>at</strong> ACDD,it is assumed th<strong>at</strong> future steelhead would gain access to additional habit<strong>at</strong> above the extent <strong>of</strong> SFPUC’sproperty. The Upper <strong>Alameda</strong> <strong>Creek</strong> Basin extends roughly 12 miles above ACDD, although theuppermost extent <strong>of</strong> the basin lacks suitable steelhead habit<strong>at</strong> (Figure 6-1). Based on analysis <strong>of</strong> aerialphotography, the uppermost extent <strong>of</strong> <strong>Alameda</strong> <strong>Creek</strong> is highly ephemeral. An aerial survey conducted inOctober 2002, following a dry w<strong>at</strong>er year, found th<strong>at</strong> <strong>of</strong> the approxim<strong>at</strong>ely 9.4 miles surveyed betweenACDD and the upper extent <strong>of</strong> <strong>Alameda</strong> <strong>Creek</strong>, 2.7 miles were dry (Entrix, 2003). At th<strong>at</strong> time it wasestim<strong>at</strong>ed th<strong>at</strong> approxim<strong>at</strong>ely 4 <strong>of</strong> the 6.7 miles <strong>of</strong> wetted channel between ACDD and the upper extent <strong>of</strong><strong>Alameda</strong> <strong>Creek</strong> had potential to support rearing juvenile steelhead.An on-the-ground survey conducted in August and September 2005, following an above normal w<strong>at</strong>eryear, found th<strong>at</strong> 90 percent <strong>of</strong> the reach between ACDD and Camp Ohlone was wetted (HagarEnvironmental Science, 2008). The extent <strong>of</strong> the channel th<strong>at</strong> remains wetted through the dry season, andthe extent to which portions <strong>of</strong> the wetted channel provide suitable O. mykiss rearing habit<strong>at</strong> will varyannually, but during all years the extent <strong>of</strong> suitable rearing habit<strong>at</strong> will be limited to a portion <strong>of</strong> the wettedchannel.SFPUC included a portion <strong>of</strong> <strong>Alameda</strong> <strong>Creek</strong> above the confluence with Calaveras <strong>Creek</strong>, up to CampOhlone, in their riparian zone monitoring project. Preliminary, reconnaissance-level habit<strong>at</strong> typing d<strong>at</strong>a,including identific<strong>at</strong>ion <strong>of</strong> riffles, fl<strong>at</strong>w<strong>at</strong>er, and pools, was conducted in 2005 (SFPUC, 2008b). Fl<strong>at</strong>w<strong>at</strong>erhabit<strong>at</strong> accounted for almost 50 percent <strong>of</strong> the surveyed reach, with pool comprising 30 percent, and riffle20 percent. Roughly half <strong>of</strong> the surveyed reach is below the confluence with Calaveras <strong>Creek</strong>, andtherefore outside <strong>of</strong> the Upper <strong>Alameda</strong> <strong>Creek</strong> Basin and the primary study area for this memorandum.Single-pass spawning surveys were conducted <strong>at</strong> several loc<strong>at</strong>ions in <strong>Alameda</strong> <strong>Creek</strong> in 2006 (SFPUC,2008c), and six additional passes were made <strong>at</strong> overlapping and nearby loc<strong>at</strong>ions between February andApril 2007 (Brian Sak, pers. comm., 2009b). Roughly 3,000 feet upstream <strong>of</strong> ACDD, an approxim<strong>at</strong>ely1,000-foot-long reach <strong>of</strong> <strong>Alameda</strong> <strong>Creek</strong> is domin<strong>at</strong>ed by exceptional spawning and rearing habit<strong>at</strong>, andone redd was observed during the single pass survey in 2006 (SFPUC, 2008c). In 2007, six redds and fivediggings were observed in a 1.9-mile-long reach th<strong>at</strong> begins 0.6 mile upstream <strong>of</strong> ACDD and continuesupstream to near Camp Ohlone (Brian Sak, pers. comm., 2009b). The reach <strong>of</strong> <strong>Alameda</strong> <strong>Creek</strong>immedi<strong>at</strong>ely above Camp Ohlone contains areas <strong>of</strong> suitable spawning gravel and pools with cover in theform <strong>of</strong> large woody debris and root wads (SFPUC, 2008c).ACDD <strong>Passage</strong> June 2009 Page 6-1