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:&'EMA LMMP PROGRAM CITY OF FORT COLLINS LARIMER COUNTY Cooper Slough ,July 13, 1992 PagEl 3 of 4 ~ field walk throuah of the oroiect r@ach follc)wed the meeting. Cooper Slough at County Road 48 (Vine Street) . One 30" diameter CMP culvert is in place across County Road 48. The channel upstream is wide and shallow with a relatively fl at longitudinal slope, T:tl.e channel and channel overbanks con,sist of dense natural grasses approxima1:ely 18"- 24" in height. C:ooper Slough at S'~ate Highway 14 (Mulberry St%~eet) . Two 48" diame!ter cmp culverts cross Stat,e Highway 14, the channel upstream is wide and uniform at: a relatively flat slope. Ground cover consist of dense natural grasses 18"-24" in height in the overbank areas with higher grasses and cattails in the main channel bottom (approximately 36" in height). The channel downstream of State Highway 14 is wide, shallow and relatively undefined with simila.r ground covering. Cooper Slough Confluence with Box EldElr Crel~k. Cooper Slough confluences with Box Elder Creek approximately one mile south of State Highway 14 just upstream of Canal Dri ve, Drainage from Cooper Slough is discharged into Box Elder Creek from a 36" RCP culvert just: upstream of the confluence. Box Elder Overflow Locations, One of the Bo:( Elder Creek overflows into the Cooper Slough drainage basiil. is at the Interstate 25 underpass for the Colorado and :;outhern Railroad, approximat:ely one-half mile north of ColClrado Highway 14. The railroad crossing is trapezoidal in section with a bottom width of approximately 100 feet and 1:1 concrete paved side slopes. It appears that the flow through this opening ...rould travel overland in a southwesterly direction to the Cooper Sloug'h/State Highway 14 crossing.