Thickness of masonry at foundations 62 feet Depth of foundation below bed of stream 13 feet Width of overfall 300 feet Length of wings 256 feet Height from foundation to overflow 29 feet Thickness of earth in rear of foundation 45 feet West facing side of stone Tunnel Diameter 12 feet Length 7 miles Depth below surface from 65 to 360 feet Two miles arched with brick Five miles through solid rock not arched Fall 1 foot per mile Capacity of discharge per day 170,000,000 gallons Top of stone Robert K. Martin Chief Engineer Wm. L. Kenly Prin. Asst. Engineer [William L. Kenly Principal Engineer] Wm. R. Warfield Res. Engineer of the Dam [William R. Warfield Resident Engineer of the Dam] Key stone laid Oct. 6th. 1881 [October 6, 1981] Bridges The reservoir is home to several historic bridges, four having been built for roads to cross the reservoir. Loch Raven Drive's original bridge was built in 1906 on a dangerous road that included a hairpin turn which caused many accidents. In 1988 the bridge was removed in favor of a safer bridge. The second bridge was built in 1914 on Maryland 146 and known as the Matthews Bridge. The Matthews Bridge was demolished in 1978 in favor of a more modern bridge. The third bridge is the Old Paper Mill Bridge, built in 1922 on Maryland 145 in place of a covered bridge that once stood there. An accompanying span was built in 2001 that now handles road traffic, but the 1922 bridge has been preserved for recreational use. The final bridge is on Warren Rd. The bridge was built in 1923 and still in use to this day. On October 26, 1958 one of the bridges was the site of a UFO sighting when two men in a car approached the bridge and reported seeing a "large, flat egg-shaped object" hovering above the bridge. Then the two men felt a burning sensation on their skin after the odd object left and were examined at a local hospital. This case was investigated by Project Blue Book. Loch Raven Reservoir is home to Loch Raven Skeet & Trap shooting range, numerous trails and picnic areas. Visitors can also go fishing or boat in their personal watercraft, and boats may also be rented dockside. The reservoir also has running trails and a frisbee golf course. In addition to these trails, on