9593

• UCREFRP Catalog Number: 9593
• Author: Tetra Tech Inc.
• Title: Concept Development Report Hartland Diversion Dam Fish Passage Structure Delta, Colorado.
• USFW Year: 2000.
• USFW - Doc Type: Grand Junction, CO.
• Copyright Material: NO

being incorporated to the development of the alternatives that reflect concerns for diversion
operations. First, intakes for diverting flows into the fish ladder and attractive flow facility
include shut off gates or stop logs to terminate fish passage operations in the event diversion
operations are adversely impacted. The second consideration for design and operations is that
the fish passageway structure be located on the opposite bank as the ditch and headgate. The
purpose of this is two-fold; maintenance of either the ditch headgate or the fish ladder is easier
to implement if facilities are on opposite banks and having lateral separation between the two
fCicilities reduces the potential for accidental drift of fish from the ladder back into the facilities.
3.5 Miscellaneous Facility Requirements
There are several additional issues and design constraints for this facility that are used
to develop the alternatives for the Hartland fish passage design. These are listed below.
1. Use metal baffles as opposed to concrete. They are easier to replace and/or alter
(Mefford 2000b).
2. Install grates on the top of the fish ladder to prevent trash and debris from entering
the ladder under flood or high water conditions.
3. Include a log boom and trash rack on the upstream of the fish ladder.
3.6 Fish Screen Criteria
With the introduction of a fish ladder on the main stem of the Gunnison, an increase in
fish above the Hartland diversion is anticipated, including the endangered razorback sucker
and Colorado pikeminnow. This may, in turn, increase the numbers of fish that accidentally
enter the Hartland Ditch. The Upper Colorado Endangered Fish Recovery Implementation
Program (UCRIP) fish screen design criteria was developed from the National Marine Fisheries
Service (NFMS 1997) fish screening criteria for anadromous salmonids, and the Washington
Department of Fish and Wildlife (WDFW 2000). Using this information, the U.S. Bureau of
Reclamation, in the Pre-design Memorandum for fish screen alternatives at the Grand Valley

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