Feasibility of Fish Passage at Alameda Creek Diversion Dam

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Feasibility of Fish Passage at Alameda Creek Diversion Dameffect on the currently isolated population’s long-term genetic integrity, in turn supportingpreservation of O. mykiss stock.7.1.5 REDUCE RISK OF EXTINCTION THROUGH INCREASEDNATURAL PRODUCTION AND CREATION OFADDITIONAL INDEPENDENT POPULATIONSPassage at ACDD could potentially create an additional, independent population of steelhead thatcould supplement the existing Central California Coast steelhead DPS. Passage directly aboveACDD would provide access to stream habitat potentially suitable for spawning and rearing, roughlyestimated to be somewhere between 4 and 10 miles based on the limited data available (seeSection 6.1). As described in Section 4.4, this habitat may be sufficient to support 100 pairs ofsteelhead spawners, the estimated number of spawning pairs sufficient to create a sustainablepopulation. This assertion is based on a review of available literature and imposition of professionaljudgment, rather than any direct quantification of spawning habitat or precise measure of currentrainbow trout spawning behavior in Alameda Creek. A detailed spawning habitat survey would needto be conducted to obtain a more accurate picture of habitat availability above ACDD.Passage at ACDD would increase steelhead habitat availability in the Alameda Creek Watershed. Ifsteelhead are re-established at other locations in the watershed, then habitat made available bypassage at ACDD would also be of integrative value to the Alameda Creek Watershed steelheadmetapopulation. Historically, steelhead likely spawned in streams throughout the watershed. Accessto some of these streams may have occurred intermittently, because it would have depended onannual hydrologic conditions or the state of various migration obstacles, and subpopulations withinthe watershed may have historically augmented each other following years of limited production inselect reaches. Therefore, facilitating access to habitat upstream of ACDD could potentially augmenta steelhead metapopulation in the Alameda Creek Watershed. This benefit to a metapopulation couldpotentially exist even if the productivity of the population above ACDD was low in some years, orwas insufficient to sustain itself without contributions from other occupied habitats in the AlamedaCreek Watershed.7.2 OHLONE TRAP AND HAUL OPTIONThis section evaluates the likelihood of the Ohlone Trap and Haul option to meet the goals of fishpassage. As identified in Section 5.3, an Ohlone Trap and Haul fish passage option would include thefollowing three design components:■■■Confluence Fish FacilityCamp Ohlone Haul RouteFish ScreensImmigrating adult steelhead would be captured at the Confluence Fish Facility, located at theconfluence of Calaveras Creek and Alameda Creek, below Little Yosemite (Figure 4-5). Arrivingfish would be transported along the Camp Ohlone Haul Route to their release point above ACDD. Itmay also be desirable to release some of the captured fish immediately above Little Yosemite, toaccess habitat between that potential barrier and ACDD. Screening at the ACDT would prevent fishfrom being entrained in the diversion tunnel, and a fish screen bypass would allow emigratingjuveniles and post-spawn adults safe downstream passage at ACDD.ACDD Passage June 2009 Page 7-4
7.0 Evaluation of the Biological Benefit of Two Passage OptionsThe potential for this option to meet each of the stated goals of fish passage is addressed below. Inmany cases, the ability of this option to meet the goals is similar to that for the ACDD Fish Ladderoption described in Section 7.1. Therefore, the emphasis of the analysis in this section is ondifferences between this Ohlone Trap and Haul option and the ACDD Fish Ladder option.7.2.1 PROVIDE ACCESS TO ADDITIONAL QUANTITY OFHABITAT TO INCREASE NATURAL PRODUCTIONAccess to habitat above ACDD would be the same as with the ACDD Fish Ladder option (seeSection 7.1). Because immigrating steelhead would be collected at the Confluence Fish Facilitybelow Little Yosemite, the Ohlone Trap and Haul option could preclude steelhead access to theapproximately 3 miles of Alameda Creek between its confluence with Calaveras Creek and LittleYosemite, unless multiple release locations are used. This reach’s suitability, relative to habitat aboveACDD, has not been well studied, but it may hold less water through the dry season than the reachabove the dam (see Section 6.1). Because the habitat upstream of the dam is more extensive than thatbetween the dam and the confluence, even if it precluded access to this 3-mile reach this option stillwould provide access to additional amount of habitat. With multiple release locations, this optionwould provide access to roughly the same habitat as the ACDD Fish Ladder option.7.2.2 CONTRIBUTE TO SPECIES RECOVERY THROUGHINCREASED NATURAL PRODUCTIONPassage design components should maximize capture efficiency and minimize stress due to handling,as practicable, in order to maximize production and increase the potential for fish passage at ACDDto result in a spawner replacement ratio of greater than 1:1 (see Section 6.2). Passage-relatedproductivity of the Ohlone Trap and Haul option would depend on ladder efficiency for the adultcapture facility (expected to be less than 3 percent loss) and losses during transport (expected to beless than 1 percent loss). Additionally, capture, holding, transport and release stress could lead toincreased adult pre-spawn mortality rates, after the fish have been released. With proper institutionalsupport and funding, a well-designed, well-managed Ohlone Trap and Haul option should be able tominimize these risks, and may contribute to steelhead recovery in Alameda Creek.7.2.3 PROVIDE ACCESS TO HISTORICAL HABITATThe ability of an Ohlone Trap and Haul option to meet this goal, if multiple fish release locationswere used, would be the same as discussed in Section 7.1 for an ACDD Fish Ladder option.7.2.4 PROTECT OR ENHANCE THE GENETIC INTEGRITYAND/OR DISTINCTNESS OF STOCKSThe ability of an Ohlone Trap and Haul option to meet this goal would be the same as discussed inSection 7.1 for an ACDD Fish Ladder option.7.2.5 REDUCE RISK OF EXTINCTION THROUGH INCREASEDNATURAL PRODUCTION AND CREATION OFADDITIONAL INDEPENDENT POPULATIONSThe ability of an Ohlone Trap and Haul option to meet this goal would largely be similar to thatdiscussed in Section 7.1 for an ACDD Fish Ladder option. The reestablished population couldACDD Passage June 2009 Page 7-5
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T E C H N I C A L M E M O R A N D U
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Feasibility of Fish Passage at Alam
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1.0 Introduction1 INTRODUCTION1.1 B
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24Alamo680DanvilleAlameda CreekWate
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oleyriesSanCalaveras Creekalaveras
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(a)(b)Alameda Creek Diversion Dam (
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2.0 Setting2.3.2.1 ALAMEDA CREEK DI
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2.0 Settingalmost never submerged;
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2.0 SettingRainbow trout are the sa
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2.0 SettingA number of future proje
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Page 42 and 43: (a) A view of the navigation lock a
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Page 57: Approximately 1.8 miles toCalaveras
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Page 89 and 90: 9.0 Report Preparation9 REPORT PREP
Page 91 and 92: 10.0 References10 REFERENCESAACE (A
Page 93 and 94: 10.0 ReferencesHayes, Darrel, 2001.
Page 95 and 96: 10.0 ReferencesSak, B., San Francis
Page 97: 10.0 ReferencesWDFW (Washington Dep
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Feasibility of Fish Passage at Alameda Creek Diversion Dam

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