1998 assessment for Volga River

Volga River IA 01-VOL-289

mouth (S36 T92N R4W Clayton Co.) to confluence with Cox Cr. in S21 T92N R5W Clayton Co.).

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

Assessment Cycle

1998

Result Period

1994 - 1996

Designations

Assessment Type

Monitored

Integrated Report

Category 0

Legacy ADBCode

IA 01-VOL-0010_1

Overall Use Support

Not supporting

Aquatic Life Use Support

Threatened

Fish Consumption

Not assessed

Primary Contact Recreation

Not supporting

Documentation

Assessment Comments

Assessment is based on results from DNR monthly monitoring station near Elkport, Clayton County.

Basis for Assessment

Had no violations of Class B(WW) water quality criteria in the 24 samples collected during the 1996-97 period; thus, assess support of Class B (aquatic life) uses as FST due to known threats from agricultural nonpoint sources. Assessed support of Class A (primary contact recreation) uses as NS due to a geometric mean of the 13 samples of fecal coliform bacteria of 401 (i.e., greater than the WQS of 200 fecal coliforms per 100 ml), and levels of fecal coliforms in 31 % of the samples exceeded 400 fecal coliforms per 100 ml (i.e., greater than 10% of samples as identifed in EPA guidelines for Section 305(b) reporting). The March/April 1998 Iowa Conservationist identifies this reach of the Volga River as providing good angling opportunities for smallmouth bass.

Monitoring and Methods

Assessment Key Dates

9/24/2001	Fixed Monitoring End Date
10/7/1999	Fixed Monitoring Start Date

Methods

230	Fixed station physical/chemical (conventional plus toxic pollutants)
420	Water column surveys (e.g. fecal coliform)

Monitoring Levels

Biological	0
Habitat	0
Physical Chemistry	3
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
Pathogens	Overall Use Support	High	Source Unknown	High
Pathogens	Primary Contact Recreation	High	Source Unknown	High

Water Quality Assessments

Impaired Waters List