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Transportation System Development Charge (TSDC) Information

The Clackamas County Board of Commissioners adopted an ordinance to administer Transportation System Development Charges (TSDC). TSDC’s are one-time fees assessed to new or expanded developments in unincorporated Clackamas County and the Happy Valley / Clackamas County Joint Area.

The TSDC is figured based on which area your property is in. If your property is located within the Happy Valley / Clackamas County Joint Area, you are assessed a different SDC than the people residing in unincorporated areas of Clackamas County. Please see the map below to determine which area you are in:

TSDC Urban Map

Type of Development County Wide
(Unincorporated Areas)
Happy Valley /
Clackamas County Joint Area
Single Family Residential / Manufactured Home $3,560 $7,682
Apartment $2,500 $5,394
Condo / Townhome $2,180 $4,704
Accessory Dwelling Unit $2,500 $5,394
Temporary Permit for Care** $500 $500
Other Use - Not Specified

Costs are per Dwelling Unit
** The TSDC assessed on ‘Temporary Permit for Care’ / ‘Health Hardship’ homes will not be refunded upon removal of the home. **

Find the ordinance, rate details and forms or contact Diedre Landon at dlandon@clackamas.us. They are also available through the Engineering Division in the permits lobby at the Development Services Building at 150 Beavercreek Road in Oregon City.

Residential permits

Note: Development within the city of Happy Valley is reviewed by their city staff. Please visit visit Happy Valley’s website or call 503-783-3800 for additional information.

Commercial permits

All commercial permits (including new uses, change of occupancy and tenant improvements) must provide a Statement of Use which will be reviewed prior to issuance so that the TSDC rate can be determined. TSDC rates will vary, depending on the use of the structure. Land Use Categories are listed on the back of the 'Statement of Use' form.

Download the 'Statement of Use' form, or find it at the Lobby Counter. This form needs to be completed in full and returned to the Engineering Counter in order to clarify the type of development and past use of the space.
(See additional information regarding commercial development.)

Note: Development within the City of Happy Valley is reviewed by their city staff. Please visit Happy Valley's website or call 503-783-3800 for additional information.

Additional information

The fee, based on the number of vehicle trips a particular land use generates, is set to cover the cost of transportation facilities needed to serve the new or expanded development and the people who will occupy or use the development. A TSDC can be included in the final calculation of building permit fees for residential and commercial projects, if applicable.

The county annually adjusts the TSDC rates to account for the changes in costs of acquiring and constructing transportation facilities in the county. The annual adjustment is calculated as a formula that includes the change in average market value of undeveloped land in the county, changes in construction costs, and the change in construction costs according to the Engineering New Record (ENR) Northwest (Seattle, Washington) Construction Cost Index. The annual review and adjustment is conducted and implemented in order to ensure sufficient funding for the construction of increased capacity facilities. These fees are subject to change as early as February of each year.

Find the ordinance, rate details and forms or contact Diedre Landon at dlandon@clackamas.us. They are also available through the Engineering Division in the permits lobby at the Development Services Building at 150 Beavercreek Road in Oregon City.

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Development Services Building

Transportation Engineering

Phone number 503-742-4691
Address 150 Beavercreek Road
Oregon City, OR 97045
map
Hours M-Th: 8 a.m. to 4 p.m.
F: 8 a.m. to 3 p.m.

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