Water Quality Summary


7437GRAND FALLS FLOWAGE, Indian Township

Midas: 7437

  • Basin: Basin #2

The Maine Department of Environmental Protection (ME-DEP) and the Volunteer Lake Monitoring Program (VLMP) have collaborated in the collection of lake data to evaluate present water quality, track algae blooms, and determine water quality trends. This dataset does not include bacteria, mercury, or nutrients other than phosphorus.

Water quality monitoring data for Grand Falls Flowage have been collected since 1983. During this period, three years of basic chemical information were collected, in addition to Secchi Disk Transparencies (SDT). In summary, the water quality of Grand Falls Flowage is appears to be below average, based on measures of SDT, total phosphorus (TP), and Chlorophyll-a (Chla). The potential for nuisance algae blooms on Grand Falls Flowage is moderate-high.

Water Quality Measures: The Flowage has an average SDT of 3.9m (12.8ft ). The range of water column TP for Grand Falls Flowage is 8-15 parts per billion (ppb) with an average of 11 ppb, while Chla ranges from 2.9-3.5 ppb with an average of 3.2 ppb. There are no color data for Grand Falls, therefore it is unclear to what extent the below-average transparency is due to natural color, although the TP is fairly high. Recent dissolved oxygen (DO) profiles show little DO depletion in deeper areas of the flowage. The potential for TP to leave the bottom sediments and become available to algae in the water column (internal loading) is low.

Filename: gran7437, Revised: 2/01, By: rjb


Lake depth mapWater quality informationglossary


See the Maine Department of Environmental Protection Explanation of Lake Water Quality Monitoring Report for measured variable explanations. Additional lake information can be found on the Internet at http://www.pearl.maine.edu and/or http://www.maine.gov/dep/blwq/lake.htm, or telephone Maine Department of Environmental Protection at 207/287-3901 or Maine Volunteer Lake Monitoring Program at 207/783-7733.