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
- 2020
- Release Status
- Final
- Data Collection Period
- Overall IR Category
- 5 - Water is impaired or threatened and a TMDL is needed.
- Trend
- Unknown
- Created
- 8/31/2020 2:17:51 PM
- Updated
- 10/16/2020 9:26:04 AM
Assessment Summary
The Class A2 use was assessed as “fully supported” based on indicator bacteria (E. coli) monitoring data. The Class A3 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 “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
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 10070001 Beaver Creek near Cedar Falls Iowa DNR 6 BIO See Below 947 Beaver Creek Cedar Falls Class A2 -
Indicator Bacteria: 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 10070001 6 22 / 3 166.44 485.05 573.2 No 2 9% No Monitored Full Class A3 -
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 10070001 6 22 / 3 166.44 485.05 573.2 Yes 16 73% Yes Monitored Partial Class A - pH: Site ID Data Source ID # Samples / # Years Maximum Value Mean Value Median Value # Violations % Violations Significantly >10% Violations Assessment Type Support Level 10070001 6 36 / 3 8.4 8.1 8.1 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 10070001 6 Ammonia 36 / 3 0.37 0.05 0.02 0 / 0 0% / 0% No Monitored Full 10070001 6 Chloride 36 / 3 26 18 18 0 / 0 0% / 0% No Monitored Full 10070001 6 Dissolved oxygen 36 / 3 13.7 10.2 9.6 NA / 0 NA / 0% No Monitored Full 10070001 6 pH 36 / 3 8.4 8.1 8.1 0 / NA 0% / NA No Monitored Full 10070001 6 Sulfate 36 / 3 30 20 20 0 / NA 0% / NA No Monitored Full 10070001 6 Temperature 36 / 3 24 11.4 11.3 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 10070001 6 Aluminum 9 / 2 5.5 1.579 0.93 0 / 0 0% / 0% No Evaluated Full 10070001 6 Arsenic 9 / 2 1.3 0.93 0.93 0 / 0 0% / 0% No Evaluated Full 10070001 6 Cadmium 9 / 2 0.025 0.025 0.025 0 / 0 0% / 0% No Evaluated Full 10070001 6 Chromium 9 / 2 1.1 0.84 0.86 0 / 0 0% / 0% No Evaluated Full 10070001 6 Copper 9 / 2 1.6 0.81 0.73 0 / 0 0% / 0% No Evaluated Full 10070001 6 Lead 9 / 2 0.2 0.069 0.06 0 / 0 0% / 0% No Evaluated Full 10070001 6 Nickel 9 / 2 2.5 2.1 2 0 / 0 0% / 0% No Evaluated Full 10070001 6 Selenium 9 / 2 1.7 1.2 1.2 0 / 0 0% / 0% No Evaluated Full 10070001 6 Zinc 9 / 2 3.2 1.66 1.4 0 / 0 0% / 0% No Evaluated Full Class
BWW1 - Biological Sampling: Benthic
Macroinvertebrates: BioNet Site ID Date Drainage Area (mi2) Ecoregion Major Drainage BM Sample Gear BMIBI score BMIBI Class 47c BMIBI BIT BMIBI Pass/ Fail 947 10/5/15 391 47c MS/WW Float ArtSub 64 Good 52 Pass 947 10/9/14 391 47c MS/WW ArtSub 56 Good 52 Pass Overall: Community Assessment Type Assessment Result Support Level Earned IR Category Actual IR Category Reason Benthic
Macroinvertebrates Monitored Pass (2/2) Full 1 1 Assessment
is monitored because all samples used were 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 10070001 6 Cadmium 9 / 2 0.025 0.025 0.025 9 No All Non-Detect Full 10070001 6 Chromium 9 / 2 1.1 0.84 0.86 0 No Evaluated Full 10070001 6 Copper 9 / 2 1.6 0.81 0.73 0 No Evaluated Full 10070001 6 Nickel 9 / 2 2.5 2.1 2 0 No Evaluated Full 10070001 6 Selenium 9 / 2 1.7 1.2 1.2 0 No Evaluated Full 10070001 6 Zinc 9 / 2 3.2 1.66 1.4 0 No Evaluated Full
Assessment Key Dates
1/7/2016 | Fixed Monitoring Start Date |
12/11/2018 | Fixed Monitoring End Date |
10/9/2014 | Biological Monitoring |
10/5/2015 | Biological Monitoring |
Methods
230 | Fixed station physical/chemical (conventional plus toxic pollutants) |
315 | Regional reference site approach |
320 | Benthic macroinvertebrate surveys |
420 | Indicator bacteria monitoring |