West Fork Cedar River IA 02-WFC-801
from confluence with Shell Rock R. (S4 T90N R14W Black Hawk Co.) to confluence with Maynes Cr. in S7 T91N R17W Butler 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
- Unknown
- Created
- 9/8/2020 9:28:39 AM
- Updated
- 10/16/2020 10:00:00 AM
Assessment Summary
The Class A1 use was assessed as "partially supported" due to levels of indicator bacteria (E. coli) that violated state water quality criteria. The Class BWW1 use was assessed as "partially supported" based on biological sampling data. The Class HH use was assessed as “fully supported” based on fish tissue sampling data and on water quality monitoring data. All other designated uses were "not assessed".
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 2016-2018 10070003 West Fork Cedar River at Finchford Iowa DNR 6 BIO See Below 280 West Fork Cedar River Finchford Iowa DNR 6 BIO See Below 1062 West Fork Cedar River N of New Hartford – WC001 Iowa DNR 6 FT See Below 117 West Fork Cedar River S of Allison Class A1 -
Indicator Bacteria: Site ID Data Source ID # Samples / # Years 2016 Geometric Mean 2017 Geometric Mean 2018 Geometric Mean Annual Geometric Mean Violation # Violations % Violations Significantly >10% Violations Assessment Type Support Level 10070003 6 22 / 3 146.06 227.1 322.57 Yes 11 50% Yes Monitored Partial 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 10070003 6 36 / 3 8.9 8.1 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 10070003 6 Ammonia 36 / 3 0.59 0.05 0.02 0 / 0 0% / 0% No Monitored Full 10070003 6 Chloride 36 / 3 21 16 16 0 / 0 0% / 0% No Monitored Full 10070003 6 Dissolved oxygen 36 / 3 14.2 10.1 9.6 NA / 0 NA / 0% No Monitored Full 10070003 6 pH 36 / 3 8.9 8.1 8.2 0 / NA 0% / NA No Monitored Full 10070003 6 Sulfate 36 / 3 45 25 23 0 / NA 0% / NA No Monitored Full 10070003 6 Temperature 36 / 3 24.7 11.5 11.2 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 10070003 6 Aluminum 9 / 2 1.9 0.73 0.36 0 / 0 0% / 0% No Evaluated Full 10070003 6 Arsenic 9 / 2 1.8 1.34 1.5 0 / 0 0% / 0% No Evaluated Full 10070003 6 Cadmium 9 / 2 0.025 0.025 0.025 0 / 0 0% / 0% No Evaluated Full 10070003 6 Chromium 9 / 2 1.1 0.81 0.82 0 / 0 0% / 0% No Evaluated Full 10070003 6 Copper 9 / 2 2.1 0.89 0.9 0 / 0 0% / 0% No Evaluated Full 10070003 6 Lead 9 / 2 0.31 0.081 0.07 0 / 0 0% / 0% No Evaluated Full 10070003 6 Nickel 9 / 2 2.9 2.3 2.2 0 / 0 0% / 0% No Evaluated Full 10070003 6 Selenium 9 / 2 1.2 0.92 0.95 0 / 0 0% / 0% No Evaluated Full 10070003 6 Zinc 9 / 2 8 2.2 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 47c BMIBI BIT BMIBI Pass/ Fail 280 8/15/18 850 47c MS/WW Float ArtSub 79 Excellent 52 Pass 280 9/9/14 850 47c MS/WW Float ArtSub 72 Good 52 Pass Fish: BioNet Site ID Date Drainage Area (mi2) Ecoregion Major Drainage/Thermal Riffle Stream? FIBI score FIBI Class 47c FIBI BIT FIBI Pass/ Fail 1062 9/21/05 824 47c MS/WW Und 35 Fair 44 Fail
Overall: Community Assessment Type Assessment Result Support Level Earned IR Category Actual IR Category Reason Benthic
Macroinvertebrates Monitored Pass (2/2) Full Fish Evaluated Fail (0/1) Partial Overall Evaluated Fail Partial 3bu 3bu Assessment
is evaluated because it included samples not collected in the last five
years. Class HH-F -
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 10070003 6 Cadmium 9 / 2 0.025 0.025 0.025 9 No All Non-Detect Full 10070003 6 Chromium 9 / 2 1.1 0.81 0.82 0 No Evaluated Full 10070003 6 Copper 9 / 2 2.1 0.89 0.9 0 No Evaluated Full 10070003 6 Nickel 9 / 2 2.9 2.3 2.2 0 No Evaluated Full 10070003 6 Selenium 9 / 2 1.2 0.92 0.95 0 No Evaluated Full 10070003 6 Zinc 9 / 2 8 2.2 1.2 0 No Evaluated Full Class HH – Fish Tissue Sampling: Site ID Date Species Name Biopart # in sample chlordane result chlordane violation (>0.6)? PCBs result PCBs violation (>0.2)? Hg result Hg violation (>0.3)? Assessment Type Support Level 117 9/20/2012 smallmouth
bass plug 4
0.182 No Evaluated Full 117 9/16/2011 smallmouth
bass plug 4
0.415 Yes Evaluated Partial 117 9/16/2011 channel
catfish fillet 4 <0.03 No 0.091 No 0.136 No Evaluated Full
Assessment Key Dates
9/21/2005 | Biological Monitoring |
9/3/2013 | Biological Monitoring |
9/16/2011 | Fish Tissue Monitoring |
9/20/2012 | Fish Tissue Monitoring |
1/7/2016 | Fixed Monitoring Start Date |
12/11/2018 | Fixed Monitoring End Date |
9/9/2014 | Biological Monitoring |
8/15/2018 | Biological Monitoring |
Methods
150 | Monitoring data more than 5 years old |
230 | Fixed station physical/chemical (conventional plus toxic pollutants) |
260 | Fish tissue analysis |
315 | Regional reference site approach |
320 | Benthic macroinvertebrate surveys |
330 | Fish surveys |
420 | Indicator bacteria monitoring |