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Rain and melting snow wash dirt and chemicals off road and into streams and lakes. Pavement prevents rain and snow-melt water from infiltrating into the ground, so more stormwater flows more quickly into streams. The pollutants and extra flow can damage streams by increasing erosion and harming the aquatic ecosystem.

The Oregon Department of Transportation’s Stormwater Program is dedicated to protecting water resources from the impacts of highway runoff. ODOT and resource agencies work together to develop consistent, effective and practical stormwater management requirements. The Stormwater Program provides technical assistance to highway project teams as they select and design stormwater management facilities.

Successfully managing stormwater requires the environmental and permitting knowledge in the Stormwater Program, the engineering and design skills of the Hydraulics Program, and the expertise of the Erosion and Sediment Control Program. Together these programs work to help ODOT protect and improve the quality of Oregon’s waters.

Oregon stormwater facility locationsStormwater Facility Information

ODOT's Hydraulics Program monitors stormwater facilities, the operations and maintenance manuals located at each facility, as well as related program data. As of 2016, ODOT maintains more than 1,000 facilities statewide.

Please refer to the Hydraulics Manual for additional information and project requirements, or contact the Hydraulics Program staff.

Site Identification

Each stormwater facility is assigned a unique drainage facility identification number. The DFI number is used to link the facility with an operations and maintenance manual and with ODOT's asset management systems.

Obtaining a Drainage Facility ID

To obtain a DFI number, contact the Hydraulics Program lead during PS&E.

Please refer to chapter 17 of the Hydraulics Manual for additional information.

Accessing Stormwater Inventory Information

ODOT's stormwater inventory is available through TransGIS, a web-based program accessible to anyone.

Viewing Operations and Maintenance Manuals

  • Once in TransGIS, select "Drainage" from the menu on the left.
  • Select "Stormwater Management Facilities."
  • Select "Apply" at the bottom of the screen.
  • Facilities will be noted by a green marker on the map. You may view the manual of any facility with a corresponding blue "I" button.
  • Once a site is selected, facility information and links to the manual and maintenance tables will open.

Operations and Maintenance Manuals

Each stormwater facility is required to have a dedicated operations and maintenance manual that describes:

  • The type of facility;
  • How the facility operates;
  • Outlines the inspection schedule; and
  • Summarizes required maintenance work. 

Guidance on the preparation of an operations and maintenance manual can be found in chapter 4 of the Hydraulics Manual.  

Maintenance Tables

Stormwater facility maintenance work is summarized in the following series of tables. Maintenance actions depend on the facility type.


Guidance Materials

Additional support for specific geo-hydro and environmental needs in the form of:

  • Standard drawings and details,
  • Drafting manuals,
  • CAD standards,
  • ODOT workspace, and
  • Example drawings and templates.

Contact the Geo-Environmental Section's Drafting Program for information.


  • Clean Water Act
  • Safe Drinking Water Act
  • Endangered Species Act

Contact the Geo-Environmental Section

4040 Fairview Industrial Drive SE, MS 6
Salem, Oregon 97302
Phone: 503-986-3252
Fax: 503-986-3249

Program Contacts

Phone: 503-986-3365
Phone: 503-986-3551

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