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<br />"'~-'--'-~ "n <br /> <br />006638)' Douglas Pass slides, Garfield County. This is probably the most active <br />landslide area in Colorado. The most critical part is a section <br />extending about three miles each way from the pass. The area includes <br />earthflows, debris flows, rockfall, and a wide variety of rotational and <br />translational landslides. Movement in many areas is so active that the <br />terrain can change completely within the period of a year. This <br />important energy-lands corridor is disrupted annually with highway <br />closures and pipeline breaks. In 1985 and 1986, CGS did a two phase <br />study for the Colorado Department of Highways. The first was a detailed <br />study adjacent to the existing alignment to identify all slide areas and <br />evaluate possible mitigation or relocation near the present right-of-way. <br />The second phase waS to map a broad area centered on Douglas Pass to be <br />used in long-term planning that might include a major relocation to avoid <br />the troublesome slide areas. <br /> <br />FUNDING SOURCES: CDOH, FHA <br /> <br />9) Tunnel siding/Debeque Canyon slide, Mesa County. This is a very large <br />and interesting slide with a history of several movements during the past <br />60 years. Bob Schuster of the USGS is currently investigating the <br />history of movement including the major 1924 event that reportedly <br />blocked the Colorado River. Current interest by CGS, USGS and CDOH <br />should lead to more detailed evaluation within the next one to three <br />years. <br /> <br />10) Mesa Verde access road slides (on ascent to mesa level). No action to <br />date on thlS slide by CGS. However, we received notification in 1986 <br />from the National Park Service that the road would be "repaired". Tilis <br />is a recurring problem area that should receive special attention from <br />State and Federal agencies to seek a more satiSfactory so1ution to the <br />periodic closures and high maintenance costs of this road. <br /> <br />11) McC1ures Pass slides, Gunnison County. These are extensive and serious <br />slides that have periodically damaged or closed Colorado Highway 133 most <br />years for the past 15 years. CGS made a photogeologic and field <br />inspection from new aerial photographs in 1986. Road maintenance was not <br />excessive this year, so no further action was taken because of other more <br />urgent issues. <br /> <br />12) Ruedi Reservoir slides, Pitkin and This area was <br />propose y ot er agencles an nee s pre lmlnary photogeologic work. <br />Preliminary field reconnaissance was carried out in spring, 1396. <br /> <br />13) Roan Creek landslide/earthflow area, Garfield Count~ This is a very <br />large new earthflow that formed overnight in the spring of ~935. It <br />originated in a wedge of old landslide material on the steep valley side <br />slopes of Roan Creek. <br /> <br />WORK COMPLETED. CGS assisted State Emergency Services staff in a <br />warning system to alert a nearby rural resident if the flow advanced tJ <br />wh~re it was a serious concern. In addition, we made a field <br />reconnaissance of the slide and its environs, and studied adja;ent <br />reaches of Roan Creek to determine if similar older slides ~lj previously <br />blocked the stream or shown other serious consequences. A report and <br />evaluation was sent to Garfield County and the Division of Jisaster <br />Emergency Services. <br /> <br />- 4 - <br /> <br />