North Fork Long Creek IA 02-IOW-666

mouth (S26 T75N R6W Washington Co.) to confluence with unnamed tributary in SW 1/4 S1 T75N R7W Washington Co.

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

Assessment Cycle

2000

Result Period

1996 - 1998

Designations

Assessment Methodology

2000 Methodology Document

Assessment Type

Evaluated

Integrated Report

Category 0

Legacy ADBCode

IA 02-IOW-0091_1

Overall Use Support

Partial

Aquatic Life Use Support

Partial

Documentation

Assessment Comments

Assessment is based on occurrence of a fish kill in August 1999.

Basis for Assessment

SUMMARY: The general aquatic life uses of this stream were assessed as "partially supported." EXPLANATION: A fish kill occurred in this stream reach on August 1, 1999, downstream from Ainsworth in Washington County. The kill was attributed to sewage from the Ainsworth municipal wastewater lagoon. An estimated 4,500 fish were killed. According to DNR's assessment methodology for Section 305(b) reporting, occurrence of a single pollution-caused fish kill within the most recent three-year period indicates that the aquatic life uses of a waterbody are only "partially supported." Thus, the general aquatic life uses of this stream were assessed as "partially supported."

Monitoring and Methods

Assessment Key Dates

8/1/1999	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
Organic enrichment/Low DO	Overall Use Support	Moderate	Source Unknown	Moderate
Unionized Ammonia	Overall Use Support	Moderate	Municipal Point Sources	Moderate