Beaver Creek IA 02-CED-555
mouth (S34 T90N R14W Black Hawk Co.) to confluence with South Beaver Cr. in S25 T90R R17W Butler Co.
- Assessment Cycle
- 2024
- Release Status
- Pending
- Data Collection Period
- Overall IR Category
- 5 - Water is impaired or threatened and a TMDL is needed.
- Trend
- Unknown
- Created
- 11/1/2023 8:12:54 AM
- Updated
- 2/1/2024 7:17:07 AM
Assessment Summary
The Class A2 use was assessed as "fully supported" based on water quality monitoring data that shows support for indicator bacteria (E. coli). The Class A3 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 “fully supported” based on ambient water quality monitoring data and on biological sampling data. The Class HH use was assessed as "fully supported" based on water quality monitoring 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 2020-2022 10070001 Beaver
Creek near Cedar Falls
CRWQ 23 WQ CY 2020-2022 99990069 Beaver
Creek
CRWQ 23 WQ CY 2020-2022 99990074 Beaver
Creek
CRWQ 23 WQ CY 2020-2022 99990075 Beaver
Creek
Iowa DNR 6 BIO See Below 373 Beaver
Creek New
Hartford – REMAP #76 Iowa DNR 6 BIO See Below 947 Beaver
Creek Cedar
Falls Class A2 - Indicator Bacteria: Site ID Data Source ID # Samples per Year (2020/ 2021/2022) 2020 Geometric Mean 2021 Geometric Mean 2022 Geometric Mean Violates Annual Geometric Mean? # 2020 SSM violations / SSM Violations needed for impairment # 2021 SSM violations / SSM Violations needed for impairment # 2022 SSM violations / SSM Violations needed for impairment Violates Annual SSM Significantly >10% Rule? Assessment Type Support Level 10070001 6 8/8/8 130 250 424 NO 0 / 3 0 / 3 0 / 3 NO Mon Full 99990069 23 5/5/5 237 160 123 NO 0 / NA 0 / NA 0 / NA NO Eval Full 99990074 23 5/5/5 346 89 197 NO 0 / NA 0 / NA 0 / NA NO Eval Full 99990075 23 5/5/5 267 150 174 NO 0 / NA 0 / NA 0 / NA NO Eval Full Site ID Data Source ID # Samples per Year (2020/ 2021/2022) 2020 Geometric Mean 2021 Geometric Mean 2022 Geometric Mean Violates Annual Geometric Mean? # 2020 SSM violations / SSM Violations needed for impairment # 2021 SSM violations / SSM Violations needed for impairment # 2022 SSM violations / SSM Violations needed for impairment Violates Annual SSM Significantly >10% Rule? Assessment Type Support Level 10070001 6 8/8/8 130 250 424 YES 2 / 3 4 / 3 6 / 3 YES Mon Not 99990069 23 5/5/5 237 160 123 YES 3 / NA 1 / NA 3 / NA YES Eval Not 99990074 23 5/5/5 346 89 197 YES 4 / NA 2 / NA 3 / NA YES Eval Not 99990075 23 5/5/5 267 150 174 YES 2 / NA 2 / NA 2 / NA YES Eval Not Classes A2 & A3 - 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 10070001 6 36 / 3 7.6 8.5 8.2 0 7 NO Mon Full 99990069 23 14 / 3 7.36 8.53 8.1 0 4 NO Mon Full 99990074 23 14 / 3 7.73 8.45 8.09 0 4 NO Mon Full 99990075 23 14 / 3 7.78 8.47 8.11 0 4 NO Mon Full Class BWW1 - Binomial 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 10070001 6 Chloride 36 / 3 16 29 20 NA 0 / 0 7 NO Mon Full 99990069 23 Chloride 15 / 3 14.3 24.5 18.4 NA 0 / 0 4 NO Mon Full 99990074 23 Chloride 15 / 3 14.3 26.5 19.2 NA 0 / 0 4 NO Mon Full 99990075 23 Chloride 15 / 3 14.4 25.1 19.4 NA 0 / 0 4 NO Mon Full 10070001 6 Dissolved Oxygen 36 / 3 7.4 13.8 10.3 0 NA / NA 7 NO Mon Full 99990069 23 Dissolved Oxygen 15 / 3 4.4 12.8 8.5 2 NA / NA 4 NO Mon Full 99990074 23 Dissolved Oxygen 15 / 3 4.7 12.9 8.4 1 NA / NA 4 NO Mon Full 99990075 23 Dissolved Oxygen 15 / 3 4.5 13.1 8.4 1 NA / NA 4 NO Mon Full 10070001 6 pH 36 / 3 7.6 8.5 8.2 0 NA / NA 7 NO Mon Full 99990069 23 pH 14 / 3 7.36 8.53 8.1 0 NA / NA 4 NO Mon Full 99990074 23 pH 14 / 3 7.73 8.45 8.09 0 NA / NA 4 NO Mon Full 99990075 23 pH 14 / 3 7.78 8.47 8.11 0 NA / NA 4 NO Mon Full 10070001 6 Sulfate 36 / 3 12 33 23 0 NA / NA 7 NO Mon Full 99990069 23 Sulfate 15 / 3 14.3 26.2 21.5 0 NA / NA 4 NO Mon Full 99990074 23 Sulfate 15 / 3 12.7 27.1 22 0 NA / NA 4 NO Mon Full 99990075 23 Sulfate 15 / 3 14.7 26.9 22.1 0 NA / NA 4 NO Mon Full 10070001 6 Temperature 36 / 3 0.1 25.9 11.2 0 NA / NA 7 NO Mon Full 99990069 23 Temperature 15 / 3 5.7 26 18.8 0 NA / NA 4 NO Mon Full 99990074 23 Temperature 15 / 3 5 25.3 18.5 0 NA / NA 4 NO Mon Full 99990075 23 Temperature 15 / 3 4.4 24.7 18.4 0 NA / NA 4 NO Mon 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 10070001 6 Ammonia 36 / 3 0.28 0.04 0.02 0 / 0 NO Mon Full 10070001 6 Cadmium 20 / 3 0.5 0.5 0.5 0 / 0 NO Mon Full 10070001 6 Chromium 20 / 3 2 0.6 0.5 0 / 0 NO Mon Full 10070001 6 Lead 20 / 3 1 0.9 1 0 / 0 NO Mon Full 10070001 6 Nickel 20 / 3 2.3 1 0.9 0 / 0 NO Mon Full 10070001 6 Selenium 18 / 2 2 0.8 0.5 0 / 0 NO Mon Full 10070001 6 Silver 20 / 3 1 0.902 1 0 / 0 NO Mon Full 10070001 6 Zinc 20 / 3 5.2 1.3 0.5 0 / 0 NO Mon Full
Benthic Macroinvertebrates: Site ID Date Drainage Area (mi2) Ecoregion Major Drainage BM Sample Gear BMIBI score BMIBI Class 47c BMIBI BIT BMIBI Pass/ Fail 373 8/25/20 375 47c MS Art Sub 73 Good 52 Pass 947 8/19/19 391 47c MS Art Sub 70 Good 52 Pass Site ID Date Drainage Area (mi2) Ecoregion Major Drainage Riffle Stream? FIBI score FIBI Class 47c FIBI BIT FIBI Pass/ Fail 373 8/25/20 375 47c MS No 58 Good 44 Pass Overall: Community Assessment Type Assessment Result Support Level IR Category Reason Benthic
Macroinvertebrates Monitored Pass (2/2) Full
Fish Evaluated Pass (1/1) Full 1 Assessment was monitored
because the BMIBI assessment used multiple Overall Monitored Pass Full samples collected in the
last five years. Class BWW1 - Continuous DO Monitoring: 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 NA NA NA 0/4 No
373 6 0/0/0/0/15 16 hr NA NA NA NA 0/4 No Evaluated Full
Class HH - 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 10070001 6 Selenium 18 / 2 2 0.8 0.5 11 NO Mon Full
Class A3 - Indicator Bacteria:
Class BWW1 - Biological Sampling:
Fish:
Assessment Key Dates
1/9/2020 | Monitoring Start |
12/8/2022 | Monitoring End |
8/25/2020 | Biological Monitoring |
8/19/2019 | Biological Monitoring |
5/17/2018 | Monitoring Start |
9/28/2020 | Monitoring End |
Methods
200 | Physical/Chemical Monitoring |
315 | Regional reference site approach |
320 | Benthic macroinvertebrate surveys |
330 | Fish surveys |
380 | Quantitative physical habitat assessment |
420 | Indicator bacteria monitoring |