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ENGINEER'S INSPECTION REPORT INSPECTOR: MJG <br />UFFICE OF THE STATE ENGINEER - DIVISION OF WATER RESOURCES • DAM SAFETY BRANCH 1313 SHERMAN STREET, ROOM 818, DENVER, CO 80203, (303) 866-3581 <br />IAME: SMITH T: 310S R: 0730W S: 3 COUNTY: COSTILLA DATE OF INSPECTION: 4/22/2009 <br />D 350103 YRCompl: 1914 DAM HEIGHT(FT): 32.0 SPILLWAY WIDTH(FT): 78.0 PREVIOUS INSPECTION: 7/16I2008 <br />CLASS. Si�nific,int h.it,ud DAM IENGTH(FT): 585.0 SPILLWAY CAPACITY(CFS): 12200.0 NORMAL STOf2AGE (AF): 4U5U U <br />DIV: 3 WD: 35 CRESTWIDTH(FT): 12.0 FREEBOARD (FT}: 8.1 SURFACE AREA(AC): 587 0 <br />EAP: 21512008 CRESTELEV(FT): 7730.0 DRAINAGE AREA (AC.): 225000.0 OUTLET INSPECTED: 9/5/1988 <br />CURRENT RESTRICTION: -- NONE -- <br />OWNER: TRINCHERA IRRIGATION CO OWNER REP.: TRACY KESTER <br />ADDRESS: P.O BOX 41 CONTACT NAME: TRACY KESTER <br />BLANCA CO 81123-0000 CONTACT PHONE: (719) 379-3467 <br />!NSPECTION PARTY Tracy Kester, Jerry Smith Roger & Cole Wakasugi Bob Schultz <br />�EPRESENTING TIC TIC WC <br />i i <br />FIEID <br />CONDITIONS <br />OBSERVED <br />WATER LEVEL: BELOW DAM CREST <br />�ROUND MOISTURE CONDITION. <br />�d� DRY <br />Fr. AboveSpillway 0 � 5 FT. GAGERODREADING ZS 1 <br />�.� WET �J SNOWCOVER OTHER <br />83 <br />DIRECTIONS: MARK AN X FOR CONDITIONS FOUND AND UNDERLINE WORDS THAT APPLY <br />� � <br />PROBLEMSNOTED; �(0)NONE I�/I (1)RIPRAP- MISSING, SPARSE, DI PI.A�, WFATHERED ��/� (2�WAVEEROSION- WIfH�CARP� <br />(3; CRACKS sVl'H DISPtACEMEN f I�(4) SINKHOLE ��/I (5) APPFARS TOO STEEP I�/� (6) pFPRE��S�gN$ OR ��ILGES � I(7) SLIDES <br />(B; CONCRETE FACING - HC)t FS CRACKS DISP�ACCD, UNUEf2MMED I�/� (9) OTHER �/IIIOW BfUSFI <br />Oriainal dam construction included a concrete core wall with a relativelv narrow "selected earth" im�ervious zone on the uostream side The <br />uastream shell consists of borrow �it run overlaid bv one and two man stones" on uostream sloae as shown in Fiaure 1 11) (2) Wave <br />erosion and disniaced noran has been Identified in previous inspection reoorts as a maintenance item reauirina action as a Condition of Full <br />Storaae. The item was not addressed and as a result the unstream slope sustained considerable damaae durina a recent intense snow <br />storm accomnamed bv hiah easterlv winds. The slone protection consists mostiv of larae rock and apoears to have been re worked over the <br />vears. The recent weather event caused the downslooe miQrat(on of the boulders as a result of under minina bv wave action The erosion <br />sulted in 6 hiph vertical scarns with voids between the rockfill which could be qrobed several feet horizontaliv into the embankment The <br />rrow selected earth core aooears to be exnosed in the deeoer voids (51 Slope was oriqinallv constructed steeoer than desirable at 1 5 1 <br />and is now near vertical due to scarps. /61 Due to re-workina the sloue over the vears and the wave damaqe the slo�e has a verv uneven <br />appearance. 19) Dense willow thickets qrow on the slope below the normal water surface on either end of the dam <br />CONDIiIONS OBSERVED � Good � A�eplable ❑X Poor <br />VROBLEMS NOTED I��(�Oj NONE , I(11 RUIS OR PUUDI.FS ��/l(12) EROSION j�(13) CRACKS • WI fH UISPIACFMFNT I�(14) SINKHOLES <br />,(15) NOT WIDE ENOUGH F�/I(16) LOW AREA I I(17) MISALIGNMENT L�/�(10) IMPROPER SURFACE DRAINAGE I I(19) OTHER <br />(12) Minor on D/S shoulder where trails access crest U/S shoulder is eroded where scar�s meet edqe of crest 1161 Near the outlet the crest <br />saas noticeablv. Elevation vanes bv �2 over lenath of crest (181 Part of the crest drains toward D/S slooe but does not appear to be causina <br />anv real problems. <br />CONUIiIONS OBSERV[D � Good ❑X A��plable � p <br />PROBLEMS NOTED �_ �(20) NONE I �(21) �IVESTOCK DAMAGE I�/�(22) FFiQ�SIQN OR GULLIES ��(23) CRACKS - WITH DISPI.ACEMENT ��(24) SINKHOLE <br />�d,'(25)APPEqRST00STEEP I�(26) DFPRFSSIUNSOR BUIGCS LJ(27)SLIDE � 1(28)SOFTAREAS ��/�(29)OTHER BNSh <br />Overall the sloae has a reasonablv uniform aonearance esoecialiv considerina the vintaqe of construction (22) A fairlv well defined trail <br />crossed the slooe. f251 Anaears steener than desirable but the shell is oit run and rockfill Slooe shows no sians of instabilitv or inaoient <br />movement (29) Heaw willow brush Qrows alonq the toe makina msoection difficult Minor saqe brush qrows on the slooe on both ends of <br />dam <br />CONDIiIONS OBSERVED � Good ❑X ,4cceptable � Poor <br />Page 1 of 4 <br />