Cedar River IA 02-CED-456
from confluence with McCloud Run (SW 1/4 S16 T83N R7W Linn Co.) to confluence with Bear Cr. in NE 1/4 S21 T84N R8W Linn Co. (includes East West Seminole and Northwest well fields for city of Cedar Rapids water supply).
- Assessment Cycle
- 2020
- Release Status
- Final
- Data Collection Period
- Overall IR Category
- 4 - Water is impaired or threatened and a TMDL has been completed or is not needed.
- Trend
- Unknown
- Created
- 8/28/2020 10:26:37 AM
- Updated
- 10/13/2020 6:57:54 AM
| Cycle Added | Class | Cause | Data Source | Rationale |
|---|---|---|---|---|
| 2014 | Class A1 | pH | Ambient monitoring: USGS | New data: WQ improvement (chemical / physical / bacterial) |
| 2014 | Class BWW1 | pH | Ambient monitoring: USGS | New data: WQ improvement (chemical / physical / bacterial) |
Assessment Summary
The Class A1 use was assessed as “fully supported” based on pH monitoring data. Since this was the second consecutive cycle that pH data did not violate the pH criteria, the Class A1 pH impairment has been de-listed. The Class BWW1 use was assessed as "partially supported" based on biological sampling data. Additionally, since this was the second consecutive cycle that pH data did not violate the pH criteria, the Class BWW1 pH impairment has been de-listed. The Class C (drinking water) use was assessed as "fully supported” based on water quality monitoring; however, the Class C use will need to be assessed as "fully supported" for the next IR cycle to be moved from IR Category 4a to IR Category 1. The Class HH (fish consumption) use was assessed as "fully supported" based on water quality monitoring data. Note: A TMDL for nitrate in this segment of the Cedar River was prepared by DNR and approved by EPA in January 2007. Thus, the historic nitrate impairment in this segment is appropriate for Category 4a of Iowa’s Integrated Report.
Assessment Explanation
Data Source Data Source ID Data Type Data Age Site ID Site Name Site Description USGS 11 WQ CY 2016-2018 5464420 Cedar River at Blairs Ferry Road at Palo,
IA USGS 11 WQ CY 2016-2016 5464480 Cedar River at Edgewood Road at Cedar
Rapids, IA CRWW 14 WQ CY 2016-2018 99990021 Cedar River Iowa DNR 6 BIO See Below 951 Cedar River Cedar Rapids – US1 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 5464420 11 27 / 3 8.9 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 5464420 11 Ammonia 27 / 3 0.61 0.08 0.02 0 / 0 0% / 0% No Monitored Full 5464420 11 Chloride 11 / 3 26.2 17.07 17.5 0 / 0 0% / 0% No Monitored Full 5464420 11 Dissolved oxygen 27 / 3 15.5 10.8 10.5 NA / 0 NA / 0% No Monitored Full 5464420 11 pH 27 / 3 8.9 8.1 8.1 0 / NA 0% / NA No Monitored Full 5464420 11 Sulfate 11 / 3 34 20 21 0 / NA 0% / NA No Monitored Full 5464420 11 Temperature 27 / 3 26.2 12.1 12.7 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 5464420 11 Chlorpyrifos-methyl 11 / 3 0.005 0.005 0.005 0 / 0 0% / 0% No Monitored Full 5464480 11 Chlorpyrifos-methyl 2 / 1 0.005 0.005 0.005 0 / 0 0% / 0% No Evaluated Full 5464420 11 Dieldrin 11 / 3 0.006 0.006 0.006 0 / 0 0% / 0% No Monitored Full 5464480 11 Dieldrin 2 / 1 0.006 0.006 0.006 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 951 10/9/14 6450 47c MS/WW Float ArtSub 51 Fair 52 Fail 951 9/19/13 6450 47c MS/WW ArtSub 44 Fair 52 Fail 951 9/28/12 6450 47c MS/WW ArtSub 41 Fair 52 Fail Overall Assessment: Community Assessment Type Assessment Result Support Level Earned IR Category Actual IR Category Reason Benthic
Macroinvertebrates Evaluated Fail (0/3) Partial 3bu 3bu Assessment is evaluated because the drainage
area of the sample site is larger than 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 5464420 11 Chloride 11 / 3 26.2 17.07 17.5 0 0% No Monitored Full 5464420 11 Fluoride 11 / 3 210 179 180 0 0% No Monitored Full 5464420 11 Inorganic nitrogen (nitrate and nitrite) 27 / 3 10.9 5.86 6.02 1 4% No Monitored Full 99990021 14 Inorganic nitrogen (nitrate and nitrite) 153 / 3 12.4 6.6 6.53 12 8% No Monitored Full The Class C drinking water use was assessed as “fully supported”.
Should this segment be assessed as “fully supported” for the next IR cycle,
the Class C impairment will be moved from Category 4a to Category 1. Class C - Toxic
Parameters: Site ID Data Source ID Parameter Name # Samples / # Years Maximum Value Mean Value Median Value Number of Non – Detects (ND) Mean Value > Criterion or MCL Assessment Type Support Level 5464420 11 Alachlor 11 / 3 0.004 0.004 0.004 11 No All ND Full 5464480 11 Alachlor 3 / 1 0.025 0.011 0.004 3 No All ND Full 5464420 11 Atrazine 11 / 3 8.14 0.955 0.086 0 No Monitored Full 5464480 11 Atrazine 3 / 1 4.16 1.44 0.11 0 No Evaluated Full 5464420 11 Carbofuran 11 / 3 0.03 0.03 0.03 11 No All ND Full 5464480 11 Carbofuran 2 / 1 0.03 0.03 0.03 2 No All ND Full 5464420 11 Simazine 11 / 3 0.004 0.004 0.003 11 No All ND Full 5464480 11 Simazine 3 / 1 0.025 0.0152 0.013 2 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 (ND) Mean Value > Criterion or MCL Assessment Type Support Level 5464420 11 Dieldrin 11 / 3 0.006 0.006 0.006 11 No All ND Full 5464480 11 Dieldrin 2 / 1 0.006 0.006 0.006 2 No All ND Full
Assessment Key Dates
| 9/28/2012 | Biological Monitoring |
| 1/5/2016 | Fixed Monitoring Start Date |
| 12/26/2018 | Fixed Monitoring End Date |
| 9/19/2013 | Biological Monitoring |
| 10/9/2014 | Biological Monitoring |
| 1/1/2007 | TMDL Completed |
| 2/1/2010 | TMDL Completed |
Methods
| 150 | Monitoring data more than 5 years old |
| 230 | Fixed station physical/chemical (conventional plus toxic pollutants) |
| 270 | PWS chemical monitoring (ambient water) |
| 315 | Regional reference site approach |
| 320 | Benthic macroinvertebrate surveys |