Nodaway River (aka West Nodaway R.) IA 05-NOD-1389
from confluence with East Nodaway R. (S6 T67N R36W Page Co.) to confluence with Middle Nodaway R. in S33 T71N R36W Montgomery Co.
- Assessment Cycle
- 2020
- Release Status
- Final
- Data Collection Period
- Overall IR Category
- 5 - Water is impaired or threatened and a TMDL is needed.
- Trend
- Stable
- Created
- 9/17/2020 10:56:07 AM
- Updated
- 10/19/2020 7:03:19 AM
Assessment Summary
The presumptive Class A1 use remains assessed as "not supported" due to levels of indicator bacteria (E. coli) that violated water quality criteria. The Class BWW1 use remains assessed as "partially supported" based on biological sampling data. The Class C and Class HH uses were assessed as “fully supported” based on water quality monitoring data.
Assessment Explanation
Sources of Data: Data
Source Data
Source ID Data
Type Data
Age Site
ID Site
Name Site
Description Iowa
DNR 6 WQ CY 2014-2016, CY 2016-2018 10730001 West
Nodaway River near Shambaugh Iowa
DNR 6 BIO See
Below 936 West
Nodaway River Shambaugh Presumptive Class A1 - Indicator Bacteria: Site
ID Data
Source ID #
Samples / # Years 2014
Geo. Mean 2015
Geo. Mean 2016
Geo. Mean Annual
Geometric Mean Violation #
Violations %
Violations Significantly
>10% Violations Assessment
Type Support
Level 10730001 6 24
/ 3 1505 911 1133 Yes 21 88% Yes Evaluated Not Presumptive Class A1 - pH: Site
ID Data
Source ID #
Samples / # Years Maximum
Value Mean
Value Median
Value #
Violations %
Violations Significantly
>10% Violations Assessment
Type Support
Level 10730001 6 36
/ 3 9 8.2 8.2 0 0% No Monitored Full Class BWW1 - Conventional Parameters: 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 10730001 6 Ammonia 36
/ 3 0.51 0.05 0.02 0
/ 0 0%
/ 0% No Monitored Full 10730001 6 Chloride 36
/ 3 15 9.4 9.3 0
/ 0 0%
/ 0% No Monitored Full 10730001 6 Dissolved
oxygen 36
/ 3 15.1 10.7 10.8 NA
/ 0 NA
/ 0% No Monitored Full 10730001 6 pH 36
/ 3 9 8.2 8.2 0
/ NA 0%
/ NA No Monitored Full 10730001 6 Sulfate 36
/ 3 34 18 18 0
/ NA 0%
/ NA No Monitored Full 10730001 6 Temperature 36
/ 3 30.4 14.5 14.9 0
/ 0 0%
/ 0% 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 %
Acute/ Chronic Violations >1
Acute / Chronic Violation Assessment
Type Support
Level 10730001 6 Aluminum 9
/ 2 25 4.39 2 0
/ 0 0%
/ 0% No Evaluated Full 10730001 6 Arsenic 9
/ 2 3.9 2 1.7 0
/ 0 0%
/ 0% No Evaluated Full 10730001 6 Cadmium 9
/ 2 0.025 0.025 0.025 0
/ 0 0%
/ 0% No Evaluated Full 10730001 6 Chromium 9
/ 2 0.92 0.46 0.43 0
/ 0 0%
/ 0% No Evaluated Full 10730001 6 Copper 9
/ 2 2.5 1.1 1 0
/ 0 0%
/ 0% No Evaluated Full 10730001 6 Lead 9
/ 2 0.27 0.073 0.025 0
/ 0 0%
/ 0% No Evaluated Full 10730001 6 Nickel 9
/ 2 4.5 2.6 2.2 0
/ 0 0%
/ 0% No Evaluated Full 10730001 6 Selenium 9
/ 2 2 1.42 1.3 0
/ 0 0%
/ 0% No Evaluated Full 10730001 6 Zinc 9
/ 2 3 1.35 1.2 0
/ 0 0%
/ 0% No Evaluated Full Class
BWW1 - Biological Sampling: Benthic
Macroinvertebrates: BioNet Site ID Date Drainage Area (mi2) Ecoregion Major Drainage/Thermal BM Sample Gear BMIBI score BMIBI Class 47f BMIBI BIT BMIBI Pass/ Fail 936 10/4/16 777 47f MO/WW Float ArtSub 34 Fair 54 Fail 936 10/1/13 777 47f MO/WW ArtSub 31 Fair 54 Fail Overall: Community Assessment Type Assessment Result Support Level Earned IR Category Actual IR Category Reason Benthic
Macroinvertebrates Evaluated Fail (0/2) Partial 3bu 3bu Assessment
is evaluated because the drainage area of the site was larger than the
calibrated range. Class C - Conventional Parameters: Site
ID Data
Source ID Parameter
Name #
Samples / # Years Maximum
Value Mean
Value Median
Value #
Violations %
Violations Significantly
>10% Violations Assessment
Type Support
Level 10730001 6 Chloride 36
/ 3 15 9.4 9.3 0 0% No Monitored Full 10730001 6 Inorganic
nitrogen (nitrate and nitrite) 36
/ 3 7 3.48 3.45 0 0% 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 10730001 6 Alachlor 3
/ 1 0.05 0.05 0.05 3 No Evaluated Full 10730001 6 Atrazine 3
/ 1 0.05 0.05 0.05 3 No Evaluated Full 10730001 6 Cadmium 9
/ 2 0.025 0.025 0.025 9 No Evaluated Full 10730001 6 Chromium 9
/ 2 0.92 0.46 0.43 0 No Evaluated Full 10730001 6 Lead 9
/ 2 0.27 0.073 0.025 5 No Evaluated Full 10730001 6 Silver 9
/ 2 0.025 0.025 0.025 9 No Evaluated Full 10730001 6 Simazine 3
/ 1 0.05 0.05 0.05 3 No Evaluated 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 10730001 6 Copper 9
/ 2 2.5 1.1 1 0 No Evaluated Full 10730001 6 Nickel 9
/ 2 4.5 2.6 2.2 0 No Evaluated Full 10730001 6 Selenium 9
/ 2 2 1.42 1.3 0 No Evaluated Full 10730001 6 Zinc 9
/ 2 3 1.35 1.2 0 No Evaluated Full
Assessment Key Dates
1/7/2014 | Fixed Monitoring Start Date |
12/6/2016 | Fixed Monitoring End Date |
10/1/2013 | Biological Monitoring |
10/4/2016 | Biological Monitoring |
1/4/2016 | Fixed Monitoring Start Date |
12/4/2018 | Fixed Monitoring End Date |
Methods
150 | Monitoring data more than 5 years old |
230 | Fixed station physical/chemical (conventional plus toxic pollutants) |
315 | Regional reference site approach |
320 | Benthic macroinvertebrate surveys |
420 | Indicator bacteria monitoring |