|The Reservoir is approximately 47 meters (155 feet) above
sea level. By comparison, Spy Pond and the Lower Mystic Lake are
both just about 1 meter above sea level. The primary feed to the
Res is Munroe Brook (also called North Brook) from Lexington. The
Arlington Great Meadows (in Lexington) is drained by Sickle Brook which
does not feed the Reservoir but flows below the earthen dam on its
Southern edge to join the discharge from the Res to form Mill
Brook. Mill Brook then flows north of Mass Avenue to discharge
into the Lower Mystic Lake at Arlington Center.
|The dashed line through the center of the Reservoir is
the Arlington-Lexington town boundary. The railroad line (with
crosshatches) is now the Minuteman Bikeway. The contour
lines are at 3 meter (10 ft) intervals.
|The image is scanned from the USGS Boston North
topographic map (42071-D1-TM-025) 1985.