Water Sample

HOPKINS POND, Mariaville

Midas: 4538

•Basin 1, 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 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 datasets for Hopkins Pond have been collected since 1974. During this period, 3 years of phosphorus and Chlorophyll information was collected, in addition to Secchi Disk Transparencies (SDT). In summary, the water quality of Hopkins Pond is considered to be above average, based on measures of SDT, total phosphorus (TP), and Chlorophyll-a (Chla). The potential for nuisance alga blooms on Hopkins Pond is low.

Water Quality Measures: Hopkins Pond is a non-colored lake (average color 7 SPU) with an average SDT of 8.0m (26.4ft). The range of TP for Hopkins Pond is 4-7 parts per billion (ppb) with an average of 7 ppb, while Chla ranges from 0.7-3.4 ppb with an average of 2.1 ppb. The dissolved oxygen (DO) profile shows no DO depletion in deep areas of the lake. The potential for TP 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 stress certain cold water fish, and a persistent loss of oxygen may eliminate or reduce habitat for sensitive cold water species