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Portland Water District - Portland, Maine
ENVIRONMENT & HEALTH
Tap Water
Watershed Protection
Water Treatment
Water Distribution
Cross Connections
Water Quality
Health Benefits
Sebago Lake
Lake Facts
Caring For The Lake
Lake Water Quality
Lake Level
Current Issues Facing Sebago Lake
Programs
Sebago Lake Land Reserve
History of Sebago Lake Protection
Wastewater
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Sebago Lake Facts

Length 12 miles
Great Basin Width 5 miles
Jordan Bay Width 2 miles
Sebago Lake Basin Width 1 mile
Shoreline Length 105 miles
Maximum Depth 316 feet
Mean Depth 101 feet
Volume 995 billion gallons
Residence Time 5.1 years
Orientation of Main Axis NNW


Water Inflow (estimated)
Direct Precipitation (42"/year) 94 million gallons/day
Tributary Total 450 million gallons/day
TOTAL 544 MILLION GALLONS/DAY


Water Outflow (estimated)
Evaporation (22"/year) 49 million gallons/day
Presumscot River 425 million gallons/day
Portland Water District 24 million gallons/day
TOTAL 498 MILLION GALLONS/DAY

TOTAL
Lake Level Ranges from 260.5 feet to 266.6 feet above sea level, depending on snow melt, rainfall and the opening and closing of dams.




Sebago Lake Watershed Facts

Sebago Lake Watershed Area (excluding water bodies)
Direct Watershed 171 square miles
Indirect Watershed 190 square miles
TOTAL WATERSHED 361 SQUARE MILES

Water Bodies
Sebago Lake 47 square miles
Other lakes, ponds, rivers 28 square miles
TOTAL 75 SQUARE MILES

Land Uses Within the Watershed
(source: digitized aerial photos, May 1990)
Residential 6.9%
Agriculture 2.2%
Commercial/Retail 0.2%
Timber Operations 2.5%
Undeveloped vegetated areas
(forests/fallow fields)
86.0%
Other Uses 2.2%