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C150341 Feasibility
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C150341 Feasibility
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Last modified
1/23/2015 4:19:18 PM
Creation date
10/10/2012 8:36:31 AM
Metadata
Fields
Template:
Loan Projects
Contract/PO #
CT2015-027
C150341
Contractor Name
Pisgah Reservoir and Ditch Company
Contract Type
Loan
Water District
12
County
Teller
Loan Projects - Doc Type
Feasibility Study
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ENGINEER'S INSPECTION REPORT INSPECTOR: MP3 <br />OFFICE OF THE STATE ENGINEER - DIVISION OF WATER RESOURCES - DAM SAFETY BRANCH 1313 SHERMAN STREET, ROOM 818, DENVER, CO 80203, (303) 866 -3581 <br />DAM NAME: MOUNT PISGAH T: 140S R: 070OW S: 31 COUNTY: TELLER DATE OF INSPECTION: <br />6/28/2011 <br />DAM ID: 120129 YRCompl: 1911 DAM HEIGHT(FT): 69.0 SPILLWAY WIDTH(FT): 60.0 PREVIOUS INSPECTION: <br />9/29=9 <br />CLASS: Significant hazard DAM LENGTH(FT): 610.0 SPILLWAY CAPACITY(CFS): 6073.0 NORMAL STORAGE (AF): <br />2250.0 <br />DIV: 2 WD: 12 CRESTWIDTH(FT): 12.0 FREEBOARD (FT): 11.0 SURFACE AREA(AC): <br />124.0 <br />EAR: 10/21/1994 CRESTELEV(FT): 8034.8 DRAINAGE AREA (AC.): 45460.0 OUTLET INSPECTED: <br />9/20/1990 <br />CURRENT RESTRICTION: — NONE — <br />OWNER: PISGAH RES. AND DITCH COMPANY OWNER REP.: GREG WILLIAMS <br />ADDRESS: P. O. BOX 352 CONTACT NAME: HOWARD STONE <br />ROCKY FORD CO 81067 -0000 CONTACT PHONE: (719) 689 -2277 <br />INSPECTION PARTY: GLeg WI(fiams. Hows2rd Stone _ Du in V_aId_a _ _— Mark Perry <br />_ <br />REPRESENTING: Mt PLSgah Co• /Cat1b_CwaL __ DWR o do Dam Safety <br />FIELD <br />CONDITIONS <br />WATER LEVEL BELOW DAM CREST FT. Above SptNuay GAGE Roo READING <br />33.32 <br />33.32 <br />GROUND MOISTURECONDmON: Q DRY ❑ WEr ❑ SNOWCOVER OTHER <br />DIRECTIONS: MARK AN X FOR CONDITIONS FOUND AND UNDERLINE WORDS THAT APPLY <br />UPSTREAM SLOPE <br />PROBLEMS NOTED ❑ (0)NONE ❑ (1)RIPRAP - MISSING, SPARSE, DISPLACED, WEATHERED ❑ (2) WAVE EROSION - WITH SCARPS <br />❑ (3) CRACKS WITH DISPLACEMENT ❑ (4) SINKHOLE ❑ (5) APPEARS TOO STEEP ❑ (6) DEPRESSIONS OR BULGES ❑ (7) SLIDES <br />F-1 (8) CONCRETE FACING - HOLES, CRACKS, DISPLACED, UNDERMINED O (9) OTHER <br />allowed timber or steel sheet piling to be used In lieu of the trench but it Is not known whether the sheet piling was In fact used. <br />- Granite riprap appears durable and in good condition. <br />- There is a stand of willows on the left side. Continue to control them as needed. <br />CONDITIONS OBSERVED: ❑ Good ® Acceptable Pow <br />PROBLEMS NOTED D10) NONE ❑(11 RUTS OR PUDDLES [:](12) EROSION 0(13) CRACKS - WITH DISPLACEMENT ❑(14) SINKHOLES <br />❑ (15) NOT WIDE ENOUGH ❑ (16) LOW AREA ❑ (17) MISALIGNMENT ❑ (18) IMPROPER SURFACE DRAINAGE qj (19) OTHER <br />-approximately 10-ft wide Crest appears to be level and straight. No depressions holes or changes in alignment were observed. <br />- crest should be monitored for subsidence along the alignment of the old outlet conduits. <br />- Accordina to the 1988 C -1690 as -built plans the minimum freeboard after construction was - 71.4 -ft to a low point on the crest. According to <br />the C -1690 plans the crest was overbuilt and the design freeboard was 10.9 ft. During the inspection we shot the dam crest at 54.8' (new <br />slant gage datum) and the spillway crest at 43.35 for a freeboard of 11.45 ft OK. <br />- Prior to the C -1690 construction It appears the crest was very uneven after it had been leveled according to the 1928 specifications. Since <br />1988 it appears the crest is stable. <br />CONDITIONS OBSERVED: Good Acceptable El Poor <br />DOWNSTREAM SLOPE <br />PROBLEMS NOTED ❑(20) NONE ❑ (21) LIVESTOCK DAMAGE ❑ (22) EROSION OR GULLIES ❑(23) CRACKS - WITH DISPLACEMENT 0(24) SINKHOLE <br />❑ (25) APPEARS TOO STEEP ❑ (26) DEPRESSIONS OR BULGES ❑ (27) SLIDE ❑(28) SOFT AREAS Ev] (29) OTHER <br />- The downstream slope appears to be -2H•1V The original 1911 C -55 plans shows a 2H:1V and there is no indication the downstream slope <br />has ever been modified. <br />- Remove brush and large vegetation from both left and right groins. <br />- An access road cuts along the downstream toe of the dam approximately 200 -ft right of the left end of the dam. Below the access road there <br />is a -5-ft high stone retaining wall along the spillway return channel This section of the downstream slope should be monitored for local <br />instability, especially if there Is spillway flow that could saturated the soils behind the stone wall. <br />- numerous rodent holes were observed. Control rodents. <br />- No cracking depressions or other signs of distress or instability were observed. <br />CONDITIONS OBSERVED: E] Good ❑X Acceptable ❑ Poor <br />Page 1 of 5 <br />
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