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
- 2022
- Release Status
- Final
- Data Collection Period
- Overall IR Category
- 5 - Water is impaired or threatened and a TMDL is needed.
- Trend
- Unknown
- Created
- 12/27/2021 7:52:03 AM
- Updated
- 1/13/2022 10:15:18 AM
Assessment Summary
The Class A1 use was assessed as "not supported" due to levels of indicator bacteria (E. coli) that violated state water quality criteria. The Class BWW1 use was assessed as "WINOFI" based on biological sampling data. The Class HH use was assessed as “fully supported” based on fish tissue sampling data.
Assessment Explanation
Data Sources: Data Source Data Source ID Data Type Data Age Site ID Site Name Site Description Iowa DNR 6 WQ CY 2018-2020 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 per Year (2018/ 2019/2020) 2018 Geometric Mean 2019 Geometric Mean 2020 Geometric Mean Violates Annual Geometric Mean? # 2018 SSM violations / SSM Violations
needed for impairment # 2019 SSM violations / SSM Violations
needed for impairment # 2020 SSM violations / SSM Violations
needed for impairment Violates Annual SSM Significantly >10%
Rule? Assessment Type Support Level 10070003 6 7/8/8 323 285 71 YES 5 / 3 3 / 3 0 / 3 YES Monitored Not Class A - 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 10070003 6 36 / 3 7.1 8.9 8.2 0 7 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 10070003 6 Ammonia 36 / 3 0.02 0.59 0.05 NA 0 / 0 7 NO Monitored Full 10070003 6 Chloride 36 / 3 10 21 15 NA 0 / 0 7 NO Monitored Full 10070003 6 Dissolved Oxygen 36 / 3 6.6 13.5 9.9 0 NA / NA 7 NO Monitored Full 10070003 6 pH 36 / 3 7.1 8.9 8.2 0 NA / NA 7 NO Monitored Full 10070003 6 Sulfate 36 / 3 12 45 25 0 NA / NA 7 NO Monitored Full 10070003 6 Temperature 36 / 3 0.2 27.3 11.5 0 NA / NA 7 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 10070003 6 Aluminum 14 / 3 1.5 0.6 0.4 0 / 0 NO Monitored Full 10070003 6 Arsenic 13 / 3 1.8 1.2 1.1 0 / 0 NO Monitored Full 10070003 6 Cadmium 13 / 3 0.05 0.03 0.02 0 / 0 NO Monitored Full 10070003 6 Chromium 13 / 3 1.2 0.8 0.9 0 / 0 NO Monitored Full 10070003 6 Lead 13 / 3 0.31 0.11 0.09 0 / 0 NO Monitored Full 10070003 6 Nickel 13 / 3 3.3 2.5 2.5 0 / 0 NO Monitored Full 10070003 6 Silver 13 / 3 0.025 0.025 0.025 0 / 0 NO Monitored Full 10070003 6 Zinc 13 / 3 3.8 1.9 1.6 0 / 0 NO Monitored Full Site ID Date Drainage Area (mi2) Ecoregion Major Drainage BM Sample Gear BMIBI score BMIBI Class 47c BMIBI BIT BMIBI Pass/Fail 280 8/15/18 850 47c MS Floating Art Sub 79 Excellent 52 Pass Fish: Site ID Date Drainage Area (mi2) Ecoregion Major Drainage Riffle Stream? FIBI score FIBI Class 47c FIBI BIT FIBI Pass/Fail 1062 9/21/05 824 47c MS Undetermined 35 Fair 44 Fail Overall: Community Assessment Type Assessment Result Support Level IR Category Reason Benthic
Macroinvertebrates Evaluated Pass (1/1) Full
Fish Evaluated Fail (0/1) Not Assessment was evaluated
because the drainage areas of the sample sites Overall Evaluated Fail WINOFI 3bu were greater than the
calibrated range. 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) 117 fillet 2011 channel catfish 4 49.3 0.136 0.03 0.091 117 tissue plug 2012 smallmouth bass 4 29 0.182
117 tissue plug 2011 smallmouth bass 4 39.3 0.415
Support Level Full
Class
BWW1 - Biological Sampling:
Benthic Macroinvertebrates:
Assessment Key Dates
9/21/2005 | Biological Monitoring |
9/16/2011 | Fish Tissue Monitoring |
9/20/2012 | Fish Tissue Monitoring |
1/8/2018 | Fixed Monitoring Start Date |
12/7/2020 | Fixed Monitoring End Date |
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 |