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201 Prnn.cipal Ffood Problems T'he principal flood problems aze discussed in the most cunent Flood gnsurance Study (FEMA, 1988}. A 1902 thunderstorm destroyed all bridges on Fountain Creek from Woodland Park to ]Vlanitou Springs. In Iune 1973 flaoding throughout Woodland Park resulted from a thunderstorm that was severe enough to be approved for State disaster relief funds. On July 29, 1984, a localized thunderstorm of 2.75 inches in 30 minutes was responsible for washing out a newly calstructed culveR that was 6-feet in diameter at the confluence of Crystola and Foungain j Creeks. No gauging records are available on Fountain Creek in Teller County, therefore, the _.. recurrence interval of these flow events c~nnot be assessed. The FEMA. (1988) study states that the drainage system for Woodland Pazk was built to convey not more than the 5-year recunence interval event, in compliance with criteria adopted from ~ the Pikes :Peak Area Council of Governments (Crilbert Meyer & Sons, Inc., 1979). l 2.2 Sealicnentation ~ 1 ~ Sedimentation is a concern within ~he County along Fountain Creek, and was ~eported as ~ early as tr~e 1988 FEMA report. That report noted that in the highly erodible soils, culverts and _ loc.~l drain~ige struch.ues are often blocked. Aggradation of the streambed was noted along several ~ reaches oi~ Fountain Creek. Aggradation of the channel at Teller County Road 21 (Woodland ~ Avenue) ~.ridge over Fountain Creek was specifically noted in 1988. f W'ilson & Company (1996) reported that aggradation was apparent at the Teller County ~ f ~ Road bridge over Fountain Creek. This was corroborated by discussion with Teller County ~ r personnel, ~ield observations, and comparison of historical bed elevation records with their survey ~ of April i1996. This data is presented in Table 2. Structure reliability was evaluated in that ; 4