WATER QUALITY SUMMARY

COLCORD POND, Porter

MIDAS: 3160, Sample Station #1

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 water quality, track algal blooms, and determine water quality trends. This dataset does not include bacteria, mercury, or nutrients other than phosphorus.

Water quality monitoring information for Colcord Pond has been gathered since 1992. During this period, three years of basic chemical information were collected in addition to Secchi Disk Transparencies (SDT). In summary, the water quality of Colcord Pond is considered above average based on measures of SDT, total phosphorus (TP) and Chlorophyll-a (Chla). The potential for nuisance algal blooms on Colcord Pond is low.

Water Quality Measures: Colcord Pond is an uncolored lake (average color 9 SPU) with an average SDT of 8 m (26 ft). The range of water column TP for Colcord Pond is 5 - 6 parts per billion (ppb). Chla ranges from 1.2 - 2.4 ppb. The most recent dissolved oxygen (DO) profiles taken in 2001 show no DO depletion in deep areas of the lake. The potential for phosphorus to leave the bottom sediments and become available to algae in the water column (internal loading) is low. Oxygen levels below 5 parts per million (ppm) stresses certain cold water fish and a persistent loss of oxygen may eliminate or reduce habitat for sensitive cold water species. However, all DO levels were above 5 ppm in the 2001 DO profile.

See the Maine DEP Explanation of Lake Water Quality Monitoring Report for measured variable explanations. Additional lake information can be obtained by contacting Maine DEP at 207-287-3901 or VLMP at 207-783-7733, and at these Websites: http://www.lakesofmaine.org and http://www.maine.gov/dep/water/lakes/index.html and http://www.mainevolunteerlakemonitors.org .

Filename: colc3160, Revised: 12/06, By: kah