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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />The outlet works was constructed in 1911 and was tunneled through <br />natural rock below the embankment and lined with concrete. The <br />interior lining of the tunnel is horseshoe and was approximately 7.5 <br />feet high, 6 feet wide, and 585 feet in length. About 260 feet of the <br />tunnel is upstream of the gate chamber. In 1967, the upstream portion <br />of the outlet tunnel was extended farther into the reservoir by <br />installing 40 feet of 66 inch welded steel pipe and 220 feet of 66 <br />inch reinforced concrete pipe. The original trashrack was also <br />replaced at that time. <br /> <br />The gate chamber is in the middle of the western dike and access <br />is gained through a vertical shaft down through the embankment. <br />Originally there were two sets of 48 inch gates and a set of 36 inch <br />gates on the conduit centerl ine. The set of 36 inch gates have been <br />abandoned leaving the two sets of 48 inch gates operational. During <br />the 1979-1980 winter the 48 inch gates were replaced since the reser- <br />voir had experienced heavy leakage through the operating gates. <br /> <br />In 1981 the tunnel was inspected and defects in the tunnel lining <br />between the gate chamber and the new (1967) wel ded steel pipe were <br />detected. The tunnel was repai red by install i ng a non-structural <br />concrete liner, six inches thick, between the gate chamber upstream to <br />the steel pipe, a distance of about 260 feet. This reduced the tunnel <br />size accordingly. The floor of the tunnel was also lined with six <br />inches of concrete. No repairs to the tunnel '"ere Clade downstream of <br />the gate chamber. The richt hand side of the concrete retaining wall <br /> <br />1-_ <br />