Tully Valley mudboils
Category: History
Updated: 21 hours ago
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Created byKilgore
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Slow collapse of the Otisco Road bridge over Onondaga Creek begins.Mudboil appears upstream of Otisco Road bridge; bridge deck is removed soon thereafter.USGS Mudboil project begins.Mudboil Depression Area (MDA) discharges, on average, ~29.7 tons/day of sediment to Onondaga Creek. June 12, 1992—Diversion Channel construction completed—watershed area at MDA reduced from 1.02 mi2 to 0.32 mi2 Effect of Diversion Channel on sediment loading does not appear until later in 1992.MDA discharges, on average, ~9.8 tons/day of sediment to Onondaga Creek from October 1992 through July 1993. July 1993—Bladder dam installed. Mudboil area discharges 0.4 tons/day August–September 1993.MDA discharges, on average, ~1.4 tons/day of sediment to Onondaga Creek. November 1993—Bladder dam replaced by temporary earth-fill dam. WY 1995—MDA discharges, on average, ~1.8 tons/day of sediment to OnondMDA discharges, on average, ~1.8 tons/day of sediment to Onondaga Creek. 1995–96 Pilot depressurizing wells installed either side of the Otisco Road Bridge. West side well (December 1995) East side well (January 1996).New
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eventMDA discharges, on average, ~0.7 tons/day of sediment to Onondaga Creek. During a fairly dry summer, extensive maintenance work occurs at the MDA and Rogue areas—digging of a ‘“moat” around the MDA, excavation of the entire Rouge impoundment area, and redevelopment of five depressurizing wells. Well redevelopment efforts gain little increase in flows, but sediment concentrations leaving the MDA and Rogue areas do fall in relation to the successful dredging activities.MDA and Rogue area discharges, on average, ~0.6 tons/day of sediment to Onondaga Creek. Due to an above-normal amount of precipitation during 2006, a mudboil in the southwest corner of the MDA discharges large amounts of sediment and fills ~400 feet of the moat. These sediments were removed in the summer of 2006. Land-surface subsidence is noted along the southwest rim of MDA. Increased mudboil activity also is noted in the Rogue mudboil area with associated land-surface subsidence. The wells on either sideNew
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eventTully Valley Mudslide
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