Total Maximum Daily Load for Noxious Aquatic Plants, Upper Gar Lake, Dickinson County Iowa, 2004

(2004) Total Maximum Daily Load for Noxious Aquatic Plants, Upper Gar Lake, Dickinson County Iowa, 2004. Natural Resources, Department of

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Abstract

The Federal Clean Water Act requires the Iowa Department of Natural Resources (IDNR) to develop a total maximum daily load (TMDL) for waters that have been identified on the state’s 303(d) list as impaired by a pollutant. Upper Gar Lake has been identified as impaired by noxious aquatic plants. Noxious aquatic plants are an expression of excess nutrients in the water column. The purpose of this TMDL for Upper Gar Lake is to calculate the maximum allowable nutrient loading for the lake associated with conditions that will meet water quality standards. This document consists of a TMDL for noxious aquatic plants designed to provide Upper Gar Lake water quality that fully supports its designated uses. Phosphorus, which is related through the Trophic State Index (TSI) to chlorophyll and Secchi depth, is targeted to address the impairment.