Volga River IA 01-VOL-296
confluence with Little Volga R. (S2 T92N R9W Fayette Co.) to confluence with unnamed tributary in SE 1/4 S24 T93N R10W Fayette Co.
- Assessment Cycle
- 2022
- Release Status
- Final
- Data Collection Period
- Overall IR Category
- 5 - Water is impaired or threatened and a TMDL is needed.
- Trend
- Unknown
- Created
- 12/7/2021 12:51:09 PM
- Updated
- 2/11/2022 3:59:56 PM
Assessment Summary
The presumptive Class A1 use was assessed as “not supported” due to violations of Iowa water quality criteria for indicator bacteria (E. coli). The Class BWW2 use was assessed as “fully supported” based on biological sampling data and water quality monitoring data. This segment is not designated for the Class HH use in the Iowa Surface Water Classification Document. However, a one meal/week smallmouth bass consumption advisory for mercury exists on this segment of the Volga River – see https://www.iowadnr.gov/Environmental-Protection/Water-Quality/Water-Monitoring/Fish-Tissue
Assessment Explanation
Data Sources: Data
Source Data
Source ID Data
Type Data
Age Site
ID Site
Name Site
Description Iowa
DNR 6 WQ CY
2012-2014 15330013 Volga River at Q Ave VR-40 Iowa
DNR 6 BIO See
Below 39 Volga River Maynard – Twin Bridges County Park Iowa
DNR 6 BIO See
Below 265 Volga River Randalia – VO003 Iowa
DNR 6 BIO See
Below 1024 Volga River US Twin Bridges Park – VO002 Site
ID Data
Source ID #
Samples / # Years 2012
Geometric Mean 2013
Geometric Mean 2014
Geometric Mean Annual
Geometric Mean Violation #
Violations %
Violations Significantly
>10% Violations Assessment
Type Support
Level 15330013 6 24
/ 3 259 701 239 Yes 16 67% Yes Evaluated Not Site
ID Data
Source ID #
Samples / # Years Maximum
Value Mean
Value Median
Value #
Violations %
Violations Significantly
>10% Violations Assessment
Type Support
Level 15330013 6 16
/ 2 9.1 8.17 8.1 1 6.3% No Evaluated Full Site
ID Data
Source ID Parameter
Name #
Samples / # Years Maximum
Value Mean
Value Median
Value #
Acute / Chronic Violations %
Acute/ Chronic Violations Significantly
>10% Violations Assessment
Type Support
Level 15330013 6 Ammonia 16
/ 2 0.16 0.08 0.05 0
/ 0 0%
/ 0% No Evaluated Full 15330013 6 Chloride 16
/ 2 33 31 30 0
/ 0 0%
/ 0% No Evaluated Full 15330013 6 Dissolved
oxygen 16
/ 2 10 8.4 8 NA
/ 0 NA
/ 0% No Evaluated Full 15330013 6 pH 16
/ 2 9.1 8.17 8.1 1
/ NA 6.3%
/ NA No Evaluated Full 15330013 6 Temperature 15
/ 2 28.2 14.8 14.2 0
/ 0 0%
/ 0% No Evaluated Full Site
ID Date Drainage
Area (mi2) Ecoregion Major
Drainage BM
Sample Gear BMIBI
score BMIBI
Class 47c
BMIBI BIT BMIBI
Pass/ Fail 39 7/30/18 53.8 47c MS Hess 76 Excellent 70 Pass 265 7/30/18 22.2 47c MS Hess 76 Excellent 70 Pass Fish: Site
ID Date Drainage
Area (mi2) Ecoregion Major
Drainage Riffle
Stream? FIBI
score FIBI
Class 47c
FIBI BIT FIBI
Pass/ Fail 1024 8/28/19 56 47c MS Undetermined 80 Excellent 44/65 Pass 265 8/16/19 22.2 47c MS Yes 72 Excellent 65 Pass 1024 8/29/18 56 47c MS Undetermined 76 Excellent 44/65 Pass 265 8/22/18 22.2 47c MS Yes 72 Excellent 65 Pass 39 7/31/18 53.8 47c MS Yes 76 Excellent 65 Pass 265 7/30/18 22.2 47c MS Yes 81 Excellent 65 Pass 1024 8/28/17 56 47c MS Undetermined 74 Excellent 44/65 Pass 265 8/24/17 22.2 47c MS Yes 74 Excellent 65 Pass 1024 8/31/16 56 47c MS Undetermined 71 Excellent 44/65 Pass 265 8/29/16 22.2 47c MS Yes 74 Excellent 65 Pass Community Assessment
Type Assessment
Result Support
Level IR
Category Reason Benthic Macroinvertebrates Evaluated Pass
(2/2) Full Fish Monitored Pass
(10/10) Full 1 Assessment was monitored because the FIBI assessment used
multiple Overall Monitored Pass Full samples collected in a recent five year period to complete
the assessment. Site ID Data Source ID # Days Monitoring (2016/2017/2018/ 2019/2020) DO Criteria Type # 2016 violations /
Violations needed for impairment # 2017 violations /
Violations needed for impairment # 2018 violations
/ Violations needed for impairment # 2019 violations /
Violations needed for impairment # 2020 violations /
Violations needed for impairment Violates Annual Significantly >10% Rule? Assessment Type Support Level
24 hr NA 0/15 NA NA NA No
39 6 0/15/0/0/0 16 hr NA 0/15 NA NA NA No Evaluated Full
Presumptive Class A1 – Indicator Bacteria: 2012-2014
Presumptive Class A1 - pH: 2012-2014
Class BWW2 - Conventional Parameters: 2012-2014
Class BWW2 – Biological Sampling:
Benthic Macroinvertebrates:
Overall:
Class BWW2 - Continuous DO Monitoring:
Assessment Key Dates
| 4/4/2012 | Fixed Monitoring Start Date |
| 11/5/2014 | Fixed Monitoring End Date |
| 8/31/2016 | Biological Monitoring |
| 8/29/2016 | Biological Monitoring |
| 8/24/2017 | Biological Monitoring |
| 8/28/2017 | Biological Monitoring |
| 7/30/2018 | Biological Monitoring |
| 7/31/2018 | Biological Monitoring |
| 8/22/2018 | Biological Monitoring |
| 8/29/2018 | Biological Monitoring |
| 8/16/2019 | Biological Monitoring |
| 8/28/2019 | Biological Monitoring |
Methods
| 150 | Monitoring data more than 5 years old |
| 220 | Non-fixed station physical/chemical monitoring (conventional pollutant only) |
| 222 | Non-fixed-station monitoring (conventional during key seasons and flows) |
| 315 | Regional reference site approach |
| 320 | Benthic macroinvertebrate surveys |
| 330 | Fish surveys |
| 380 | Quantitative physical habitat assessment |
| 420 | Indicator bacteria monitoring |