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A stone structure, alongside Loch Raven Drive, near the 1881 dam.
Memorial stone at Loch Raven 1881 Dam with reservoir measurements.
Memorial stone at Loch Raven 1881 Dam with tunnel measurements.

At the 1881 Loch Raven dam there is a stone with the four sides and top engraved with the following information:

North (water) facing side of stone
Loch Raven
Water surface 170 ft. A.M.T. [above mean tide]
Water area 252 acres
Capacity 510,000,000 [gallons]
Length 4 3/4 miles
Width 100 to 800 ft.
Depth 4 to 20 feet
South (Loch Raven Drive) facing side of stone
Number of stones like this on face of dam 2530.
From Beaver Dam Marble Quarry Baltimore County MD.
Each stone averaging one perch [24 3/4 cubic feet].
Total number of perches in dam 20376.
East facing side of stone
Dam
Built of rubble and cut stone on solid rock
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]