DEM Office of Water Resources
- Precipitation and drought-status data from a network of approximately 150 precipitation observation stations operated by volunteers throughout Massachusetts.
- http://www.mass.gov/dcr/waterSupply/rainfall/

Certification Status of Environmental Laboratories
- Searchable database of laboratories accredited by DEP for the analysis of drinking water and wastewater for chemistry and/or microbiology.
- http://www.mass.gov/dep/service/compliance/wespub02.htm

Knightville Dam
- Includes fees and reservation information, flood control plans, and natural resource overview.
- http://www.nae.usace.army.mil/recreati/kvd/kvdhome.htm

Mystic Watershed Collaborative (MWC)
- Envisions strategies and catalyzes the resources of Tufts University and MyRWA to address challenges and opportunities in the Mystic Watershed.
- http://www.tufts.edu/tie/mwc/

Mystic River Watershed Association
- Community organization sponsors research, activities, and conservation of the Mystic River watershed in state.
- http://www.mysticriver.org/

Nashua River Watershed Association
- Promotes water quality and conservation of open spaces. Includes descriptions of programs, a watershed map, events, a list of publications, and membership information.
- http://www.nashuariverwatershed.org/

Massachusetts Drinking Water Education Partnership
- Provides year-round educational programs and information to increase public understanding of drinking water issues. Dedicated to protecting drinking water supplies and public health through collaborative projects, culminating in Drinking Water Week event
- http://www.madwep.org

EPA Watershed Information
- Collection of watershed related resources from the Environmental Protection Agency.
- http://cfpub.epa.gov/surf/state.cfm?statepostal=MA

Littleville Lake
- Offers project map, event schedule, fees and reservation information, and natural resource overview.
- http://www.nae.usace.army.mil/recreati/lvl/lvlhome.htm

Birch Hill Dam
- Provides cultural history, location maps, brochure rack, photos, and recreation guide.
- http://www.nae.usace.army.mil/recreati/bhd/bhdhome.htm

Tully Lake
- Includes directions, flood control information, with current event and fee schedules.
- http://www.nae.usace.army.mil/recreati/tul/tulhome.htm

Hodges Village Dam
- Provides flood control information, trail maps, and current event listings.
- http://www.nae.usace.army.mil/recreati/hvd/hvdhome.htm

Buffumville Lake
- Flood control, recreation, fishing tips, maps, and fee schedules.
- http://www.nae.usace.army.mil/recreati/bvl/bvlhome.htm

West Hill Dam
- Flood control, park information, dam map, and natural resource information.
- http://www.nae.usace.army.mil/recreati/whd/whdhome.htm

Barre Falls Dam
- Flood control, recreation, and natural resource information.
- http://www.nae.usace.army.mil/recreati/bfd/bfdhome.htm

Tide Location Selection for Massachusetts
- Low and high tide predictions for Massachusetts, with sunrise, sunset, moonrise, moonset and moon phase.
- http://www.saltwatertides.com/dynamic.dir/massachusettssites.html

U.S. Army Corps of Engineers | Cape Cod Canal Field Office
- Tasked with the maintenance and upkeep of the "Widest Sea Level Canal in the World". Information on marine traffic control, recreation, natural and cultural resources.
- http://www.nae.usace.army.mil/recreati/ccc/ccchome.htm

Cape Cod Canal
- Map showing land cut of the canal with bridges, roads and recreation sites, along with information on the Canal, from the U.S. Army Corps of Engineers.
- http://www.nae.usace.army.mil/recreati/capecc.htm