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DRAFT is undermining the footings. This is occurring downstream of Watson Avenue and Park Avenue (upper crossing). Maintenance work should be performed to prevent damage to these structures. A possible solution would be to protect the footings with riprap. The two most significant flooding problems on French Creek are the overtopping of the Highway 9 culvert and the break out of the flow at Maqum Bonum Drive. The former problem would require increasing the culvert size at Highway 9. This would be expensive, and since the drainage would be limited to the highway, eliminating this problem should not be of high priority. The problem at Magum Bonum Drive could greatly improve by regrading the area so that flows overtopping the roadway would flow directly to the stream on the downstream side rather than being diverted through the development. Illinois GUlch has the most significant immediate flooding problems of all the major tributaries. Inadequately sized culverts at Columbine Road, Broken Lance Drive and Boreas Pass Road result in several areas of flow breakout. The most severe is the Columbine Road crossing which results in flooding of a loose area near the confluence with the Blue River and possibly flood flows being conveyed to Main street. This problem could be remedied by installing adequate culverts at Columbine Road and a minor amount of channel alterations. The Broken Lance Drive culvert would require replacing and some channel work to provide sufficient gradient so that the culvert does not fill with sediment as is the existing case. The Boreas Pass Road culverts would also require replacing. In all three cases, the ideal si tuation from a hydraulic standpoint, would be a box culvert since it may be difficult to convey these flows with the limited head available, through circular or arched culverts. The two most important flooding problems on Sawmill Creek are the Four O'Clock Road crossing and the general lack of an adequate channel. The solution to the Four O'Clock Road crossing would be to install a culvert with adequate cover to insure against structural failure and regrading the area to the south to confine the flow to the culvert. To correct the downstream problems would require construction of a drainageway. This would be costly and since the flooding is confined mainly to undeveloped areas, the economic feasibility would be questionable. A partial solution would be to construct a berm to divert all the flow into the main channel above sawmill Creek Condominiums to prevent flooding along Park Avenue. This would have to be prepared propserly standard and designed to prevent damage to Sawmill Creek Condominiums. The main issue for the Cucumber Gulch, South Barton Gulch, Middle Barton Gulch is the lack of a drainage corridor to the Blue River. These drainages have all had their access to the Blue River interrupted by dredge boat mining. Currently, their channels end upstream of the Blue River in dredge spoils. The inflows infiltrate into the dredge rock and are conveyed as ground water 42