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Roosting: x = 18.1cm, S.D. = 29.4, n = 80; <br />Feeding: x = 20.2cm, S.D. = 38.9, n = 39 (Howe 1985). <br />Bed /Sandbar Elevation <br />The bed/sandbar elevation was not collected with the USFWS site evaluation data. However, <br />Lingle et al. (1984, 1986) contributes information in the descriptions of two whooping crane <br />roost sites. <br />One roost site (Crane sighting number 83B -21) in Hall county was described as a shallow <br />submerged sandbar, 15m wide with a depth of 10 -13cm (Lingle et al. 1984). <br />The other roost site (Crane sighting number 85B -18) in Buffalo county near Rowe Sanctuary <br />was described as a shallow submerged sandbar, 15m wide with a depth of 20 -28cm (Lingle et <br />al. 1986). <br />Howe (1985) collected slope data throughout the migration corridor at use sites by 18 radio - <br />marked whooping cranes during 5 migrations between 1981 and 1984. Mean slope estimates <br />were 7.1 degrees for roosting sites (n =77) and 8.5 degrees for feeding sites (n =55). <br />Sediment Grain Size /Distribution <br />Information on sediment grain size /distribution was collected during the site evaluations <br />conducted for the Platte River Cooperative Agreement in spring and fall 2001. <br />While information on sediment grain size /distribution is sparse for the Central Platte river <br />area, this information was collected throughout the Aransas -Wood River migration corridor <br />at stopover sites, and reported on by Austin and Richert (2001). <br />Distance to Visual Obstructions <br />The USFWS site evaluation data includes entries for "Approximate Visibility" (miles) <br />upstream and downstream at some of the sites (Table 4). <br />Site evaluations were conducted during the Platte River Cooperative agreement surveys in <br />2001. During these surveys distance to visual obstruction was recorded upstream, <br />downstream and to either side from the roost site. <br />Proximity to Disturbance <br />The proximity to disturbance was not collected with the USFWS site evaluation data. <br />However, Lingle et al. (1984, 1986) provides information in the descriptions of two <br />whooping crane roost sites. <br />At one roost site (Crane sighting number 83B -21) in Hall county, woody vegetation along the <br />river bank provided a visual barrier between the roost site and potential disturbances. <br />Draft Baseline Report — Whooping Crane Section 10 <br />