Spring Lake–Upper Prior Lake Nutrient TMDL

This Total Maximum Daily Load (TMDL) study addresses a nutrient impairment for Spring and Upper Prior Lakes. The goal of this TMDL is to quantify the pollutant reductions needed to meet State water quality standards for nutrients in Spring Lake (70-0054) and Upper Prior Lake (70-0072). In 2002, Upper Prior Lake and Spring Lake were listed on Minnesota's 303(d) List of Impaired Waters for aquatic recreation due to excessive nutrients. This TMDL also provides Waste Load Allocations (WLA) and Load Allocations (LA) for the two impaired lakes. A numeric target of 40 μg/L total phosphorus concentration for Spring Lake, a deep lake and a numeric target of 60 μg/L total phosphorus concentration for Upper Prior Lake, a shallow lake were established. Spring Lake is centrally located within the Prior Lake-Spring Lake Watershed District.