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Services Departments Government

System Development Charges (SDC)

Transportation System Development Charges (TSDC) Parks System Development Charges (TSDC)

Transportation System Development Charges (TSDC)

Updated Jan. 1, 2018

TSDCs are one-time fees assessed on new or expanded developments in unincorporated Clackamas County based on the number of vehicle trips a particular land use generates. The fees are 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.

TSDCs in unincorporated Clackamas County


A TSDC can be included in the final calculation of building permit fees for residential and commercial projects, if applicable.

For more information, contact Wendi Coryell at, 503-742-4657 or in Transportation Engineering on the third floor of the Development Services Building, 150 Beavercreek Road, Oregon City, OR 97045.

Residential permits

TSDC fees only apply to new or expanded residential dwellings, not to replacement dwellings. County staff may require a replacement dwelling agreement to confirm the prior residence.

TSDCs for new or expanded residential dwellings are as follows:

Type of development TSDC per unit
Single-family residential / detached $4,374 / dwelling unit
Mobile home in park $2,293 / space
Apartment $3,056 / dwelling unit
Condo / townhome $2,670 / dwelling unit
Accessory dwelling unit $3,056 / dwelling unit

Commercial permits/statement of use

All commercial permits (including new uses, change of occupancy and tenant improvements) must include a completed Statement of Use form to be reviewed by the Engineering Division before the permit is issued so that any applicable TSDC rate can be determined. TSDC rates vary depending on the use of the structure. This form is needed to clarify the type of development and past use of the space.

The Statement of Use form must be completed in full and returned to the Engineering Division prior to permit issuance:

Parks System Development Charges (PSDC)

Parks System Development Charges are one-time fees charged to new development to help pay a portion of the costs to meet parks and recreation needs created by growth. PSDC fees are set by the North Clackamas Parks & Recreation District (NCPRD) based on the specific impact a development inside the NCPRD boundaries is expected to have on the District’s population and employment.

NCPRD provides a variety of park and recreational facilities, and a wide range of services including: aquatics, community athletics, special events and specialized recreation programs.

PSDC fees are subject to change as early as February of each year.

Type of development
See District Map for boundaries
Zone 1 Zone 2 Zone 3
Single-Family Residential / Manufactured Home Check Milwaukie website $6,760 $6,075
Multi-Family Check Milwaukie website 5,842 5,290
Non-Residential Check Milwaukie website 60 / emp.** 60 / emp.**
Accessory Dwelling Unit (ADU) Check Milwaukie website 3,380 3,038
Single-Room Occupancy Check Milwaukie website 2,921 2,645

** Number of employees calculated using PSDC Table 5.4, below.

For example, the parks and recreation SDC for a 40,000-square-foot office building for services such as finance, insurance and real estate would be calculated as follows:

  1. 40,000 (sq. ft. building size) ÷ 370 (sq. ft. per employee) = 108 employees
  2. 108 employees x $60 (PSDC rate) = $6,480

Table 5.4
Square Feet Per Employee

(recommended guidelines from Metro Employment Density Study)

Standard Industry Classification (SIC)* Square feet per employee
1-19 Ag., Fish & Forest Services; Construction; Mining 590
20 Food & Kindred Products 630
22, 23 Textile & Apparel 930
24 Lumber & Wood 640
25, 32, 39 Furniture; Clay, Stone, & Glass; Misc. 760
26 Paper and Allied 1,600
27 Printing, Publishing & Allied 450
28-31 Chemicals, Petroleum, Rubber, Leather 720
33, 34 Primary & Fabricated Metals 420
35 Machinery Equipment 300
36, 38 Electrical Machinery, Equipment 400
37 Transportation Equipment 700
40-42, 44, 45, 47 Transportation and Warehousing 3,290
49 Communications and Public Utilities 460
50, 51 Wholesale Trade 1,390
52-59 Retail Trade 470
60-68 Finance, Insurance & Real Estate 370
70-79 Non-Health Services 770
80 Health Services 350
81-89 Educational, Social, Membership Services 740
90-99 Government 530

* Source: U.S. Department of Commerce Standard Industrial Classification Manual

US Occupational Safety & Health Administration Standard Industrial Classification Definitions

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Development Services Building

Transportation Engineering

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

Report a Road Concern