Chetac Lake: Impacts from Heron Creek - NOR_05_08


Chetac Lake will be monitored in the summer of 2007 to develop a nutrient budget through a lake management planning grant. Two related issues that are not covered by the grant are a concern and in need of additional attention. First, Heron Creek is a tributary of the lake that is known to have relatively high phosphorus concentrations and has recently been altered by the removal of a beaver dam that previously impounded a large wetland area. Since beaver dam removal, duckweed accumulates at the stream mouth and produces noxious odors upon decomposition. Heron Creek will be sampled 8 times for total phosphorus and the duckweed dynamics of the stream will be visually examined. Second, curly-leaf pondweed is significant in the lake and may contribute to internal phosphorus cycling. An estimate of curly-leaf pondweed biomass and phosphorus content is needed. Samples will be collected, dried, and weighed to determine dry weight/ m2. Two composited, dried samples will be tested for phosphorus content. Monitoring will be done by Craig Roesler with LTE assistance, and assistance from the Chetac Lake Association. Monitoring will take place during the summer of 2007.


Heron Creek negatively impacts Chetac Lake with duckweed and phosphorus. The creek behavior needs to be better understood to determine management options. Curly-leaf pondweed contributes to internal phosphorus cycling in Chetac Lake. The magnitude of this impact needs to be estimated to assess management options.


Can duckweed and phosphorus delivery by Heron Creek be controlled or managed? Is phosphorus cycling by curly-leaf pondweed significant and can it be managed?

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