Stormwater Management
Stormwater from urban areas that discharges to streams is managed under the Oregon Department of Environmental Quality (DEQ) National Pollutant Discharge Elimination System Stormwater Permit (NPDES). Stormwater that is infiltrated into shallow wells is managed under the DEQ Underground Injection Control Permit (UIC).
NPDES Stormwater Program
- NPDES 2023 Annual Report (2.82 MB)
- NPDES 2022 Stormwater Management Plan (3.31 MB)
- NPDES 2022 Annual Report (4.41 MB)
- NPDES Municipal Separate Storm Sewer Permit 2021 (577.96 KB)
- NPDES 2022 Annual Report (4.41 MB)
- NPDES 2021 Annual Report (2.51 MB)
- NPDES 2020 Annual Report (2.72 MB)
- NPDES 2019 Annual Report (7.93 MB)
- NPDES 2018 Annual Report (4.02 MB)
- NPDES 2017 Annual Report (3.07 MB)
- NPDES 2016 Annual Report (5.69 MB)
- NPDES 2016 Annual Report (5.69 MB)
- NPDES 2015 Permit Renewal Application (2.08 MB)
- NPDES 2015 Annual Report (3.04 MB)
- NPDES 2014 Annual Report (4.35 MB)
- NPDES 2014 Stormwater Retrofit Strategy (2.6 MB)
- NPDES 2014 Pollutant Reduction Analysis (9.12 MB)
- NPDES 2014 Hydromodification Assessment (8.86 MB)
- NPDES 2013 Annual Report (4.29 MB)
- NPDES 2012 Annual Report (2.42 MB)
- NPDES 2011 Annual Report (1.69 MB)
- NPDES 2011 Stormwater Management Plan (1.75 MB)
- NPDES 2010 Annual Report (372.9 KB)
- NPDES 2010 MS4 Permit (1.76 MB)
- NPDES 2010 MS4 Permit PER Supplemental (578.06 KB)
- NPDES 2010 MS4 Permit Eval Report (5.25 MB)
- NPDES 2009 Annual Report (355.48 KB)
- NPDES 2008 Annual Report (475.41 KB)
- NPDES 2007 Annual Report (2.62 MB)
UIC Stormwater Program
- UIC 2022 Annual Report (602.34 KB)
- UIC 2021 Annual Report (99.89 KB)
- UIC 2020 Annual Report (91.05 KB)
- UIC 2019 Annual Report (175.23 KB) UIC 2019 Annual Report (175.23 KB)
- UIC 2018 Annual Report (577.58 KB)
- UIC 2017 Annual Report (492.67 KB)
- UIC 2016 Annual Report (476.77 KB)
- UIC 2015 Annual Report (467.48 KB)
- UIC 2014 Annual Report (50.24 KB)
- UIC 2014 Permit (625.72 KB)
- UIC 2014 Systemwide Assessment (4.54 MB)
- UIC 2014 Monitoring Plan (269.61 KB)
- UIC 2014 Management Plan (198.32 KB)
Design and Construction Manual
Pollution Reduction
The County minimizes impacts from Road Operations to protect endangered fish species, including coho and Chinook salmon, and steelhead trout using the Road Maintenance and Operations Manual. The County also reduces specific pollutants from streams in the unincorporated areas through a Total Maximum Daily Load Program.
TMDL Program
- TMDL 2022 Implementation Plan (966.04 KB)
- TMDL 2021 Annual Report (365.04 KB)
- TMDL FY20 Annual Report (364.56 KB)
- TMDL FY18 and 19 Annual Report (406.17 KB)
- TMDL 2018 Online 5 year report submission (101.87 KB)
- TMDL 2017 Annual Report (2.2 MB)
- TMDL 2016 Annual Report (508.38 KB)
- TMDL 2015 Annual Report (523.09 KB)
- TMDL 2014 Annual Report (205.07 KB)
- TMDL 2014 Implementation Plan (1.16 MB)
- TMDL 2013 5-Year Program Review (3.22 MB)
- TMDL 2012 Annual Report (284.63 KB)
- TMDL 2011 Annual Report (180.36 KB)
- TMDL 2010 Annual Report (180.7 KB)
Fish Related Reports
Click through to see the full photoset of the Beaver Creek Fish Survey.
- Beaver Creek Fish Species Composition, October 2011 (1.2 MB)
- Johnson Creek Fish Species Composition 2012 (1.02 MB)
- Multnomah County Fish Passage Assessment, June 2013 (29.53 MB)
- Beaver Creek Fish Survey Photoset
- Johnson Creek Fish Survey Photoset
Click through to see the full photoset of the Johnson Creek Fish Survey.
