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I I I I I I I I I I I I I I I I I I I Tucker Gulch: The study reach for Tucker Gulch begins at its confluence with Clear Creek (Cross section No.1) and ends at Cross Section No. 46, 2900 feet upstream of State Highway #93 (Foothills Road). Floodplain limits and water surface profiles for this reach are shown on Sheets 5 to 8. Development along Tucker Gulch consists of industrial, commercial and residential in the area downstream of Highway #58. Above Highway #58, residential development has continued along both sides of the drainageway. With the exception of some channelization work which has occurred upstream of 7th Place, the Tucker Gulch floodplain has experienced no significant encroachment in the upper reaches. 3. The stability of the bridge crossings could be threatened by large debris and high velocity flows characteristic of Tucker Gulch. 4. Although the hydraulic model indicates that flood flows are confined to the channel, downstream of Highway 58, the momentum of the flood waters, coupled with the existance of flood debris, could force flow out of the bank at the bend between 9th and 10th Streets, causing flood waters to continue down Ford Street. This condition may explain damages that occurred in 1965. Blocked bridges will also contribute to premature overbank flooding and higher water surface levels. 5. The existing trailer court and other properties located at the Tucker Gulch mouth are subject to inundation by 100-year flooding from both Tucker Gulch and Clear Creek (Sheet 8). Stream crossings within the reach include 10th Street, 9th Street, railroad bridge (spur to Coors Porcelain Company), State Highway #58 overpass, 7th Place, 1st Street, North Ford Street and State Highway #93. The floodplain for this reach is not widespread and has maximum widths of 200 feet to 250 feet. The stream gradient is steep with slopes exceeding 2%. 6. Coors diversion works and properties on the south bank of Clear Creek are subject to damage resulting from high velocity flows and debris entering the Clear Creek channel from Tucker Gulch (Sheet 8). Shallow flooding or sheet flow areas are shown where the 100-year water surface profile is less than the corresponding ground level but upstream conditions such as road grade overtopping cause the shallow flooding condition. The over- topping of North Ford Street is an example of this condition (Sheet 6) Cressmans Gulch: The study reach for Cressmans Gulch begins at its confluence with Tucker Gulch (Cross section No. 27.1) and ends at Cross Section No. 27.31, 3140 feet upstream of Pine Ridge Road. Floodplain limits and water surface profiles for this reach are shown on Sheets 2, 3, 4 and 6. The following paragraphs describe certain problem areas along Tucker Gulch: 1. At the North Ford Street crossing of Tucker Gulch, 100-year flows overtop the road grade by 2- to 2.5-feet. The existing culvert is capable of passing the 10-year discharge without overtopping (Sheet 6). 2. The flat slope upstream of the Church Ditch siphon causes sediment deposits downstream of the 7th Place bridge and forces floodwaters over North Ford Street for a short reach under Highway #58. In addition, the constricted channel beneath Highway #58 contributes to the problem and forces partial inundation of the 7th Place bridge superstructure (Sheet 8). Stream crossings within the study reach include an abandoned railroad grade, State Highway #93 (Foothills Road), Pine Ridge Road and a small private road 1500 feet upstream of Highway #93. Beginning at Highway #93, the alignment of Cressmans Gulch has been relocated from its historic channel to east of the abandoned railroad grade. The historic channel now ends at North Ford Street as shown on Sheet 4. The historic channel has been stationed separately for identification purposes. Development in the study area consists of two residential properties located east of North Ford Street, a residential subdivision named North Golden Edge 18