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<br />........... : <br /> <br />- - -. -~-' --' .-- ..... .'- - ---- <br /> <br />030666 <br />4) <br /> <br />Marble and vicinit , Gunnison Count. This community is affected by <br />two arge debris-f ow producing creeks which form a common debris fan. <br />Detailed geologic hazards mapping with particular emphasis on debris <br />flows was completed for this community by CGS in 1972. Additional <br />quadrangle-level geologic hazards mapping covering adjacent areas along <br />the Crystal River valley was completed in 1978. Marble has been ravaged <br />by debris flows throughout its history and much of the remaining town is <br />still vulnerable. Available geologic hazards mapping is adequate for <br />land-use decisions and planning. <br /> <br />5) Telluride and vicinity. This is a former mining town, undergoing rapid <br />growth from the nearby ski resort and summer tourism. The older parts of <br />town occupy the entire fan of Coronet Creek which has produced infrequent <br />but very large debris-flow events. The two large events of record, 1914 <br />and 1969, affected different parts of the town'but totaled about 70 <br />percent of it. The town, State and Federal agencies are aware of the <br />problems. Mitigation needs include debris control at the head of the fan <br />and channel improvements through the west part of town. Efforts to <br />accomplish needed mitigation will be difficult because of pervasive <br />existing development and historic preservation constraints. <br /> <br />FUTURE PLANS. CGS expected to have new aerial photography flown for <br />the Coronet Creek basin and the valley lands west of town along the San <br />Miguel River in 1986 with geologic hazard mapping following in 1986-87. <br />However, no funding was available. <br /> <br />6) Idaho Springs and other towns in Clear Creek corridor, Clear Creek <br />County. The numerous communities that are bUllt on debris fans 1n this <br />area are vulnerable. Although there have been no serious events in the <br />past few decades both historic and geologic data confirm the potential <br />for damaging debris flows. CGS has mapped geologic hazards for the <br />community of Idaho Springs. Also, preliminary research on fan <br />stratigraphy and radiocarbon (C14) dating has been done at several <br />locations. Another topic for applied research in this target area is the <br />investigation of some large Holocene rockfall deposits that have blocked <br />the valley in the past. Study of these could lead to better <br />understanding and evaluation of modern potential for catastrophic <br />valley-blocking landslides. <br /> <br />FUTURE PLANS. This is a very large target area and specific projects <br />will have to be isolated and prioritized. This should be done in <br />1986-87, and one or two high priority projects should be started. <br /> <br />7) Dutch Creek area west of Redstone. On several occasions debris flows <br />have been reported to have destroyed surface facilities at the mines in <br />the upper basin, and debris plugs have been reported at the mouth of the <br />main stream near Redstone. <br /> <br />FUTURE PLANS. CGS should do a photogeologic reconnaissance of this <br />basin using existing aerial photographs. Subsequently, if special needs <br />emerge in the preliminary study, additional detailed work should be <br />scheduled. <br /> <br />8) <br /> <br /> <br />These areas are located on the <br />produce <br />Debris <br /> <br /> <br />- 7 <br />