Walnut Creek IA 01-WPS-372

mouth (S18 T83N R2W Jones Co.) to confluence with White Oak Cr. in S19 T83N R3W Jones Co.

This is a Legacy Assessment. Prior to 2004, assessments were developed under a methodology that pre-dated the Integrated Report guidelines.

Assessment Cycle

2002

Result Period

1998 - 2000

Designations

Assessment Methodology

2002 Methodology Document

Assessment Type

Evaluated

Integrated Report

Category 0

Legacy ADBCode

IA 01-WPS-0109_0

Overall Use Support

Partial

Aquatic Life Use Support

Partial

Documentation

Assessment Comments

Assessment is based on occurrence of a fish kill in July 1999. See attached document for details.

Basis for Assessment

SUMMARY: The Class B(LR) aquatic life uses remain "partially supported." EXPLANATION: The previous (2000) assessment of the aquatic life uses was based on the occurrence of a fish kill in 1999 (see assessment for the 2000 report). According to IDNR's assessment methodology for Section 305(b) reporting, occurrence of a single pollution-caused fish kill within the most recent three-year period (1999-2001) indicates impairment of the aquatic life uses. Because a pollution-caused fish kill occurred on this stream during the most recent three-year period, the aquatic life uses remain assessed as "partially supported."

Monitoring and Methods

Assessment Key Dates

7/26/1999	Fishkill

Methods

140	Incidence of spills and/or fish kills

Monitoring Levels

Biological	0
Habitat	0
Physical Chemistry	0
Toxic	0
Pathogen Indicators	0
Other Health Indicators	0
Other Aquatic Life Indicators	0
# of Bio Sites	0
BioIntegrity	N/A

Causes and Sources of Impairment

Causes	Use Support	Cause Magnitude	Sources	Source Magnitude
Unionized Ammonia	Overall Use Support	Moderate	Intensive Animal Feeding Operations	Moderate
Unionized Ammonia	Aquatic Life Support	Moderate	Intensive Animal Feeding Operations	Moderate