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Last modified
7/14/2009 5:02:34 PM
Creation date
5/20/2009 10:11:37 AM
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UCREFRP
UCREFRP Catalog Number
9313
Author
Burdick, B. D., J. Flair, M. Lloyd and B. Scheer.
Title
Native and Nonnative Fish Use of Two Gravel-Pit Ponds Connected to the Upper Colorado River at 29-5/8 Road Near Grand Junction, Colorado.
USFW Year
1997.
USFW - Doc Type
Project number CAP-6-GP,
Copyright Material
NO
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restoration of gravel pits may provide <br />larval and juvenile endangered fishes. <br />seasonal, surrogate floodplain habitats <br />fishes. <br />food that should increase survival of <br />Graded gravel pits could function as <br />for use by endangered and other native <br />Protection, restoration, and enhancement of inundated bottomland habitat <br />along mainstem riparian corridors are believed to be particularly important for <br />recovery of razorback sucker. Before razorback sucker are reintroduced into <br />historical reaches of the Upper Colorado River, reconnection of the river with <br />the floodplain is essential. Reconnection of one of a few sites will not be <br />adequate for improving survival of larval endangered fishes to aid in natural <br />recruitment. Thus, additional floodplain sites will need to be identified and <br />developed to provide a series or "network" of off-channel habitats. The numerous <br />gravel-pit ponds have altered the natural floodplain by creating depressions with <br />irregular-shaped bottoms. Presently, floodplains contain primarily gravel-pit <br />ponds that are deep. Therefore, habitat acquisition and restoration activities <br />by the Recovery Program (U. S. Fish and Wildlife Service [FWS] 1987) will have <br />to focus on such features in floodplains. <br />Habitat development and enhancement is identified as one of the five <br />principal elements of the Recovery Program for endangered-fishes of the Upper <br />Colorado River Basin. The overall goals of the Recovery Program are to, 1) <br />restore razorback sucker and other endangered fishes in the Upper Colorado River <br />in the Grand Valley, and 2) restore or enhance floodplain functions by connecting <br />former floodplain to the river as habitat for the endangered fishes. <br />A final conceptual management plan was developed for Gardner Pond at 29-5/8 <br />Road, adjacent to the Upper Colorado River, near Grand Junction, Colorado, <br />describing alteration of this pond (Burdick 1994). Another pond, Hotspot Pond, <br />is immediately adjacent to Gardner Pond. The conceptual management plan <br />described alteration of Gardner Pond and foilowup fishery studies of both ponds. <br />The two ponds would be evaluated by comparing the seasonal use by native and <br />nonnative fish. Hotspot Pond is slightly graded, slopes toward the river, drains <br />mostly during low flows, and had been connected to the river for several years. <br />Gardner Pond (unconnected to the river and not sloped) is an irregular-shaped <br />depression that has been isolated from the river by a dike to protect former <br />gravel-mining activities. The recommended alteration was to remove a portion of <br />the dike at the downstream end between Gardner Pond and the river to form a <br />channel that would connect this pond with the river to provide access for <br />riverine adult razorback sucker, Colorado squawfish, and other native fishes. <br />No alteration was planned for Hotspot Pond. <br />Purpose and Objectives <br />It is critical to determine if, graded ponds sloped toward the river that <br />flood and drain seasonally, will be used and are more beneficial to endangered <br />fishes than ungraded ponds that are perennially full of water (Valdez and Wick <br />1983). If isolated ponds are to be connected to the river as habitat for <br />endangered fishes, careful consideration or evaluation of the pond's topography <br />is crucial. For example, evaluations of use by both native and nonnative fish <br />might allow managers to make recommendations for pond design and outline <br />3
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