Mississippi River IA 01-NEM-62

from Lock &Dam 15 at Davenport (Scott Co.) to Lock & Dam 14 at Le Claire (Scott Co.) (= Pool 15) (Davenport water supply intake is located near river mile 484.)

Open Data Collection Period Modal

For purposes of developing stream/river water quality assessments for integrated reporting, three years of water quality data are typically used for both conventional pollutant parameters (e.g., indicator bacteria) and the less frequently monitored toxic parameters (e.g., toxic metals). Since the 2004 IR cycle, DNR has used a three-year data gathering period for streams, rivers, and beaches. For most assessments, the use of three years of data increases the number of samples upon which the decision on use support is based and helps address the problem of weather-related year-to-year fluctuations in water quality.

Due to the lower sampling frequency in Iowa’s ambient lake, biological, fish kill, and fish tissue monitoring programs, five years of data are used for developing IR assessments and for identifying Section 303(d) listings.

Data Type	Data Timeframe
Beach Sampling Data	CY 2018 - 2020
Stream/River Water Quality Data	CY 2018 - 2020
Lake Water Quality Data	CY 2016 - 2020
Biological Sampling Data	CY 2016 - 2020*
Fish Kill Data	CY 2016 - 2020
Fish Tissue Sampling Data	CY 2016 - 2020
Continuous Dissolved Oxygen Sampling Data	CY 2016 - 2020
*Biological sites sampled in both 2015 and 2019 were also assessed.

Open Segment Map
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Cycle: 2022
Release Status: Final
Overall IR: 5 - Water is impaired or threatened and a TMDL is needed.
Trend: Unknown
Created: 12/29/2021 12:20:15 PM
Updated: 3/23/2022 12:30:28 PM

Use Support

Class A1

Recreation - Primary contact

Not Supported

Bacteria: Indicator Bacteria- fecal coliform

Support Level

Not Supported

Impairment Code

5a - Pollutant-caused impairment. TMDL needed.

Cause Magnitude

Moderate

Status

Continuing

Source

Unknown: Source Unknown

Source Confidence

N/A

Cycle Added

2016

Impairment Rationale

Geometric mean criterion exceeded

Data Source

Ambient monitoring: adjacent state

TMDL Priority

Tier IV

Class BWW1

Aquatic Life - Warm Water Type 1

Not Supported

Metals: Aluminum

Support Level

Not Supported

Impairment Code

5a - Pollutant-caused impairment. TMDL needed.

Cause Magnitude

Slight

Status

Continuing

Source

Unknown: Source Unknown

Source Confidence

N/A

Cycle Added

2006

Impairment Rationale

Violations of chronic criterion

Data Source

Ambient monitoring: adjacent state

TMDL Priority

Tier IV

Class C

Drinking Water -

Fully Supported

Class HH

Human Health -

Not Supported

Fish Consumption Advisory: PCBs

Support Level

Not Supported

Impairment Code

5a - Pollutant-caused impairment. TMDL needed.

Cause Magnitude

Moderate

Status

Continuing

Source

Industrial

Source Confidence

Moderate

Cycle Added

2016

Impairment Rationale

Fish consumption advisory in effect: no more than 1 meal/week

Data Source

Fish contaminant monitoring: federal agency

TMDL Priority

Tier IV

Impairment Delistings

No delistings for this assessment cycle.

Documentation

Assessment Summary

The Class A1 use remains assessed as "not supported" due to high levels of indicator bacteria (fecal coliforms) reported by the Illinois EPA. The Class BWW1 use was assessed as "not supported" due to violations of state water quality criteria for aluminum. The Class C use was assessed as “fully supported” based on water quality monitoring data. The Class HH use was assessed as "not supported” due to high levels of PCBs in fish tissue and the issuance of a one meal per week consumption advisory. The results of interstate consultation via the UMRBA Water Quality Task Force in February 2016 were also used to develop this assessment.

Assessment Explanation

Data Sources:

Data Source	Data Source ID	Data Type	Data Age	Site ID	Site Name	Site Description
IEPA	10	WQ	CY 2018-2020	99990016	Mississippi River	Illinois EPA Station M-02
Iowa DNR	6	FT	See Below	47	Mississippi River

Class A1 - Indicator Bacteria:

The Class A1 use remains assessed as “not supported” based on the impairment of primary contact recreation use identified for this segment of the Upper Mississippi River by the Illinois EPA for the 2016 Section 303(d) listing cycle. The Illinois EPA identified an impairment of primary contact recreation use in this river segment due to high levels of indicator bacteria (fecal coliforms). This assessment was developed as a result of interstate consultation on Section 303(d) listing conducted through the Upper Mississippi River Basin Association’s “Water Quality Task Force” in June 2016.

Class A1 – pH:

Site ID	Data Source ID	# Samples / # Years	Minimum Value	Maximum Value	Mean Value	# Violations	Violations needed for impairment	Violates Significantly >10% Rule?	Assessment Type	Support Level
99990016	10	15 / 2	6.8	10.6	7.8	1	4	NO	Monitored	Full

Class BWW1 - Conventional Parameters:

Site ID	Data Source ID	Parameter Name	# Samples / # Years	Minimum Value	Maximum Value	Mean Value	# Violations	# Acute / Chronic Violations	Violations needed for impairment	Violates Significantly >10% Rule?	Assessment Type	Support Level
99990016	10	Ammonia	15 / 2	0.05	0.75	0.16	NA	0 / 0	4	NO	Monitored	Full
99990016	10	Chloride	19 / 3	11.4	22.3	15.9	NA	0 / 0	5	NO	Monitored	Full
99990016	10	Dissolved Oxygen	15 / 2	6.4	13.8	9.5	0	NA / NA	4	NO	Monitored	Full
99990016	10	pH	15 / 2	6.8	10.6	7.8	1	NA / NA	4	NO	Monitored	Full
99990016	10	Sulfate	19 / 3	17.2	46.6	29.3	0	NA / NA	5	NO	Monitored	Full
99990016	10	Temperature	15 / 2	0.5	26	14.5	0	NA / NA	4	NO	Monitored	Full

Class BWW1 - Toxic Parameters:

Site ID	Data Source ID	Parameter Name	# Samples / # Years	Maximum Value	Mean Value	Median Value	# Acute / Chronic Violations	>1 Acute / Chronic Violation	Assessment Type	Support Level
99990016	10	4,4-DDT	19 / 3	0.005	0.005	0.005	0 / 0	NO	Monitored	Full
99990016	10	Aldrin	19 / 3	0.005	0.005	0.005	0 / 0	NO	Monitored	Full
99990016	10	Aluminum	19 / 3	1780	513.7	375	0 / 2	YES	Monitored	Not
99990016	10	Arsenic	19 / 3	2.19	0.98	1.01	0 / 0	NO	Monitored	Full
99990016	10	Cadmium	19 / 3	1.5	1.5	1.5	0 / 0	NO	Monitored	Full
99990016	10	Chloropyrifos	19 / 3	0.05	0.05	0.05	0 / 0	NO	Monitored	Full
99990016	10	Chromium	19 / 3	2.5	1	0.6	0 / 0	NO	Monitored	Full
99990016	10	Copper	18 / 3	8.17	2.56	2.13	0 / 0	NO	Monitored	Full
99990016	10	Dieldrin	19 / 3	0.005	0.005	0.005	0 / 0	NO	Monitored	Full
99990016	10	Endrin	19 / 3	0.005	0.005	0.005	0 / 0	NO	Monitored	Full
99990016	10	gamma-BHC (Lindane)	19 / 3	0.005	0.005	0.005	0 / 0	NO	Monitored	Full
99990016	10	Heptachlor	19 / 3	0.005	0.005	0.005	0 / 0	NO	Monitored	Full
99990016	10	Heptachlor epoxide	19 / 3	0.005	0.005	0.005	0 / 0	NO	Monitored	Full
99990016	10	Lead	19 / 3	4.75	2.15	2.5	0 / 0	NO	Monitored	Full
99990016	10	Nickel	19 / 3	3.35	1.36	1.13	0 / 0	NO	Monitored	Full
99990016	10	Parathion	19 / 3	0.05	0.05	0.05	0 / 0	NO	Monitored	Full
99990016	10	Pentachlorophenol (PCP)	19 / 3	0.2	0.2	0.2	0 / 0	NO	Monitored	Full
99990016	10	Phenols	19 / 3	5	4.17	5	0 / 0	NO	Monitored	Full
99990016	10	Polychlorinated Biphenyls (PCBs)	19 / 3	0.05	0.05	0.05	0 / 0	NO	Monitored	Full
99990016	10	Selenium	19 / 3	2.5	2.4	2.5	0 / 0	NO	Monitored	Full
99990016	10	Silver	19 / 3	1.5	1.5	1.5	0 / 0	NO	Monitored	Full
99990016	10	Toxaphene	19 / 3	0.5	0.5	0.5	0 / 0	NO	Monitored	Full
99990016	10	Zinc	18 / 3	5.6	2.7	2.5	0 / 0	NO	Monitored	Full

Class C - Conventional Parameters:

Site ID	Data Source ID	Parameter Name	# Samples / # Years	Minimum Value	Maximum Value	Mean Value	Median Value	# Violations	Violates Significantly >10% Rule?	Assessment Type	Support Level
99990016	10	Chloride	19 / 3	11.4	22.3	15.9	15.2	0	NO	Monitored	Full
99990016	10	Fluoride	19 / 3	90	370	142	120	0	NO	Monitored	Full
99990016	10	Inorganic nitrogen (nitrate and nitrite)	19 / 3	1.08	3.03	2.04	2.01	0	NO	Monitored	Full
99990016	10	pH	15 / 2	6.8	10.6	7.8	7.7	1	NO	Monitored	Full

Class C - Toxic Parameters:

Site ID	Data Source ID	Parameter Name	# Samples / # Years	Maximum Value	Mean Value	Median Value	Number of Non - Detects	Mean Value > Criterion or MCL	Assessment Type	Support Level
99990016	10	2,4,5-TP (Silvex)	19 / 3	0.5	0.5	0.5	19	NO	Monitored	Full
99990016	10	Alachlor	19 / 3	0.01	0.01	0.01	19	NO	Monitored	Full
99990016	10	Atrazine	19 / 3	0.52	0.13	0.05	10	NO	Monitored	Full
99990016	10	Dalapon	19 / 3	2.5	2.5	2.5	19	NO	Monitored	Full
99990016	10	Dinoseb	19 / 3	0.5	0.5	0.5	19	NO	Monitored	Full
99990016	10	Glyphosate	19 / 3	15	15	15	19	NO	Monitored	Full
99990016	10	Picloram	19 / 3	0.5	0.5	0.5	19	NO	Monitored	Full
99990016	10	Simazine	19 / 3	0.05	0.05	0.05	19	NO	Monitored	Full

Class HH-FW - Toxic Parameters:

Site ID	Data Source ID	Parameter Name	# Samples / # Years	Maximum Value	Mean Value	Median Value	Number of Non - Detects	Mean Value > Criterion or MCL	Assessment Type	Support Level
99990016	10	2,4-D	19 / 3	0.5	0.5	0.5	19	NO	Monitored	Full
99990016	10	4,4-DDD	19 / 3	0.005	0.005	0.005	19	NO	Monitored	Full
99990016	10	4,4-DDE	19 / 3	0.005	0.005	0.005	19	NO	Monitored	Full
99990016	10	4,4-DDT	19 / 3	0.005	0.005	0.005	19	NO	Monitored	Full
99990016	10	Aldrin	19 / 3	0.005	0.005	0.005	19	NO	Monitored	Full
99990016	10	Barium	19 / 3	73	53.5	53.9	0	NO	Monitored	Full
99990016	10	Copper	18 / 3	8.17	2.56	2.13	1	NO	Monitored	Full
99990016	10	Dieldrin	19 / 3	0.005	0.005	0.005	19	NO	Monitored	Full
99990016	10	Endrin	19 / 3	0.005	0.005	0.005	19	NO	Monitored	Full
99990016	10	gamma-BHC (Lindane)	19 / 3	0.005	0.005	0.005	19	NO	Monitored	Full
99990016	10	Heptachlor	19 / 3	0.005	0.005	0.005	19	NO	Monitored	Full
99990016	10	Heptachlor epoxide	19 / 3	0.005	0.005	0.005	19	NO	Monitored	Full
99990016	10	Hexachlorobenzene	19 / 3	0.005	0.005	0.005	19	NO	Monitored	Full
99990016	10	Methoxychlor	19 / 3	0.025	0.025	0.025	19	NO	Monitored	Full
99990016	10	Nickel	19 / 3	4.43	2.12	1.99	1	NO	Monitored	Full
99990016	10	Pentachlorophenol (PCP)	19 / 3	0.2	0.2	0.2	19	NO	Monitored	Full
99990016	10	Phenols	19 / 3	5	4.17	5	11	NO	Monitored	Full
99990016	10	Polychlorinated Biphenyls (PCBs)	19 / 3	0.05	0.05	0.05	19	NO	Monitored	Full
99990016	10	Selenium	19 / 3	2.5	2.4	2.5	17	NO	Monitored	Full
99990016	10	Toxaphene	19 / 3	0.5	0.5	0.5	19	NO	Monitored	Full
99990016	10	Zinc	18 / 3	23.4	10.4	10	1	NO	Monitored	Full

Class HH - Fish Tissue Sampling:

Site ID	Biopart	Year	Species	# in sample / # of samples	Avg Length (cm)	(Avg) Hg (ppm)	Chlordane (ppm)	Sum PCBs (ppm)
47	fillet	2018	channel catfish	2	44.4		0.025	0.07
47	fillet	2018	common carp	2	48.4		0.02	0.06
47	fillet	2018	common carp	3	67.3		0.023	0.12
47	tissue plug	2017	largemouth bass	3	33.1	0.147
47	tissue plug	2016	white bass	5	37.1	0.222
Support Level	Not	A one meal/week PCBs consumption advisory for common carp >20" exists on this segment. Based on IR Methodology, the Class HH (fish consumption) use was assessed as “not supported.”

Monitoring and Methods

Assessment Key Dates

1/31/2018

Fixed Monitoring Start Date

6/23/2020

Fixed Monitoring End Date

10/17/2016

Fish Tissue Monitoring

10/1/2018

Fish Tissue Monitoring

8/9/2017

Fish Tissue Monitoring

Methods

230

Fixed station physical/chemical (conventional plus toxic pollutants)

260

Fish tissue analysis

860

Other Agencies/Organizations provided monitoring data