Castle Rock & Gunderson Creek TMDL

Purpose

The Castle Rock and Gunderson Creek TMDL was created to address phosphorus, sediment, and for at least one creek biological oxygen demand. The TMDL was approved and is in implementation through projects funded by the Clean Water Act Section 319 Program.

Objective

Castle Rock Creek (also known as Fennimore Creek) (WBIC 1211300) from mile 15.5 to mile 26 and the entire 4 mile length of Gunderson Valley Creek (WBIC 1212600), a tributary to Castle Rock Creek are included on Wisconsin’s 2002 section 303(d) list of impaired waters. The streams are located in northeastern Grant County, Wisconsin and are part of the Blue River Watershed. The Blue River flows to the Lower Wisconsin River. Castle Rock Creek downstream from the impaired segment is designated as a state Outstanding Resource Water. Both streams were listed as a high priority for runoff management. priority for TMDL development on the October 2002 303(d) list. Castle Rock Creek was listed as impaired due to degraded habitat due to sedimentation that limited the stream’s coldwater fishery to the extent that the stream’s designated use was not met. In addition, Castle Rock Creek has a substantial amount of filamentous algae that is not found in nearby trout streams. Gunderson Valley Creek has similar sedimentation problems, substantial diurnal fluctuations in dissolved oxygen and common exceedances of the dissolved oxygen criterion in Wisconsin’s water quality standards. Based on these impairments, Total Maximum Daily Load (TMDL) allocations are prepared for sediment and phosphorus for both streams. These TMDLs are intended to determine the maximum amount of pollutants that can enter the stream and still allow water quality standards to be met.

Outcome

USEPA Decision Document for the Approval of the Castle Rock Creek TMDL has been issued, which approves of the TMDL. These TMDLs are intended to determine the maximum amount of pollutants that can enter the stream and still allow water quality standards to be met.

QA Measures

Run Project Summary Report

TMDL/303d Projects
Implement TMDL
Castle Rock Gunderson
2004
Complete
 
Reports and Documents
Final TMDL Report
USEPA Decision Document. 'After a full and complete review, EPA finds that the TMDLs for Castle Rock Creek and Gundreson Valley Creek satisfy all the elements of approvable TMDLs. This document addresses TMDLs for 2 waterbodies for 2 pollutants each for a total of 4 TMDLs addressing 3 impairments from the 2002 Wisconsin 303d list.'
 
Activities & Recommendations
TMDL (USEPA) Approved
Castle Rock and Gunderson Creek TMDL was created to address phosphorus, sediment, and for at least one creek biological oxygen demand.
TMDL Development
Castle Rock and Gunderson Creek TMDL was created to address phosphorus, sediment, and for at least one creek biological oxygen demand.
TMDL Implementatoin
Castle Rock and Gunderson Creek TMDL was created to address phosphorus, sediment, and for at least one creek biological oxygen demand.
 
Waters