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and conserving present subpopulations in each subbasin; and critical to <br />recovery of squawfish. One is encouraged to consult the Implementation Plan <br />(pages 6-17 to 6--32) for specific information related to particular river <br />reaches and river mileages for each of the following priority designations. <br />Priority Designation. High concentration areas <br />Confirmed spawning areas <br />Priority Designation. Concentration areas <br />Suspected spawning areas <br />Priority Designation. Total distribution areas minus concentration areas <br />Priority Designation. Historic, unoccupied habitats,-e.g., migration routes <br />Fish Passage Considerations in the UCRB <br />These same established priority designations have been used to provide a <br />"starting point" for discussion of the possible role of fish passage where <br />instream barriers presently exist or where proposed instream barriers might <br />occur in occupied or unoccupied habitats for sub-adult and adult Colorado <br />squawfish. Examples of existing and proposed instream barriers within these <br />areas in the UCRB are provided for each of these designations. Instream <br />barriers in the [7CRB have been divided arbitrarily into three categories and <br />are defined as follows: <br />--low, those that are partial or seasonal impediments to fish <br />movement <br />--medium, those that are total (100%) impediments to upstream fish <br />movement; and > 10 and < 50 vertical feet in height <br />--high, those that are total (100%) impediments to upstream fish <br />movement; and > 50 vertical feet in height <br />Situation Aa. Instream barrier in occupied reaches designated as high <br />concentration areas for sub-adult and adult Colorado <br />squawfish. <br />Example: Existing: Tusher Wash, Green River; Type: Low <br />9