In March and April 2001, many of the Mystic River's tributaries overflowed.
Other flood resources: USGS water level gage National Weather Service: how rain amounts were focused on the Mystic watershed. Alewife Neighbors' newsletter
Town of Winchester March 21, 2001 floods
Alewife Brook before
Sewer overflow and drowned cars, Alewife Parkway
Water flowing from Kimball St. to Alewife Pkwy, Cambridge