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<br />I <br />I <br />I <br />II <br />II <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />I-25 Cnlvert The crossing at Interstate 25 is a triple barrel (two 6'H x 11 'W, one 6'H x <br />l4'W) reinforced concrete box culvert. At this location, roadway overtopping occurs at a depth <br />of approximately 9,0 feet from the invert of the culvert. The capacity of the culvert prior to <br />overtopping is 2,460 cfs, The lOO-year existing condition discharge in Godding Hollow at <br />Interstate 25 is 920 cfs, therefore Interstate 25 is not overtopped during the existing condition 100- <br />year discharge. <br />WCR 10 Culvert, The crossing at Weld County Road 10 is a 2'H x 3.5'W arch corrugated <br />metal pipe culvert. ' At this location, roadway overtopping occurs at a depth of approximately 3.5 <br />feet from the invert of the culvert. The capacity of the culvert prior to overtopping is 40 cfs. The <br />lOO-year existing condition discharge in Godding Hollow at Weld County Road 10 is 540 cfs. <br />Union Pacific Railroad Bridge, This timber bridge incorporates an opening which is <br />approximately 42feet wide and 2.5 feet in height. The capacity of the bridge prior to overtopping <br />the railroad is 1,450 cfs, The lOO-year existing condition discharge in Godding Hollow at Union <br />Pacific Railroad is 370 cfs. <br />Trihutary Crossing of Interstate 25 A major tributary crosses Interstate 25 immediately <br />north of the intersection of Interstate 25 and the State Highway 52. The crossing structure consists <br />of a 36-inch siphon, The capacity of the culvert prior to overtopping is estimated to be 90 cfs. <br />The 100-year existing condition discharge at this location is estimated to be 1,230 cfs. The depth <br />of flow associated with overtopping the roadway is approximately 0.6 feet. <br />Trihutary Crossing of East WCR lOA major tributary crosses WCR 10 east of Interstate <br />25 and south of the Colorado National Speedway. The crossing structure consists of a 48-inch <br />CMP. The capacity ofthe culvert prior to overtopping is estimated to be 70 cfs, The 100-year <br />existing condition discharge at this location is estimated to be 1,190 cfs. <br />Trihutary Crossing of Interstate 25 A major tributary crosses Interstate 25 immediately <br />north of Weld County Road 8. The crossing structure consists of two 3'H x 10'W reinforced <br />concrete box culvert. The capacity of the crossing prior to overtopping is estimated to be 430 cfs. <br />The 100-year existing condition discharge at this location is estimated to be 870 cfs. <br />Within the Godding Hollow Basin, several additional road crossings of tributaries to <br />Godding Hollow also exist. These tributaries convey significant storm flows that may require <br />crossing structures capable of passing the 100-year existing condition discharge. This master <br />planning effort did not inventory or specifically identify these road crossings. It is noted, <br />however, that several of these crossing structures provided inadequate capacity to convey runoff <br />generated during relatively minor storm events and were experiencing sedimentation problems, <br />As land development occurs within the basin, these structures should be more closely inventoried <br />and evaluated. <br /> <br />T.'IOPEMCoweldOllc.oweldOJ {rII rpLwpd <br /> <br />3,8 <br /> <br />September 8, 1999 <br />