Services Departments Government

System Development Charges (SDC)

New TSDC methodology, capital project list and ordinance amendments approved; effective Jan. 1, 2018

After two years of work with an advisory committee, the Board of Commissioners approved updated TSDC methodology, rate schedule and ordinance amendments in November. They will go into effect on Jan. 1, 2018.

  1. Methodology
  2. Rate Schedule
  3. Ordinance Amendments

For additional information, contact Jimmy Thompson, Senior Policy Analyst, at 503-742-4333 or

Transportation System Development Charges (TSDC)

TSDCs in unincorporated Clackamas County

TSDCs in Happy Valley/Clackamas County Joint District

General TSDC information

Parks System Development Charges (PSDC)

Transportation System Development Charges (TSDC)

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

Happy Valley/Clackamas County Joint Area TSDC

The Happy Valley / Clackamas County Joint Area TSDC is bordered by I-205 on the west, Multnomah County on the north, approximately 172nd Avenue on the east and Highway 212 on the south. The joint district has its own fee schedule to fund transportation improvements needed within its boundaries to accommodate growth.

TSDC fees are subject to change as early as March of each year.

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


Replacement dwellings are not charged a TSDC. County staff may require a replacement dwelling agreement to confirm the prior residence.

Type of Development County Wide District Happy Valley / Clackamas County Joint District*
Single Family Residential / Manufactured Home $3,560 / dwelling unit $7,682 / dwelling unit
Apartment $2,500 / dwelling unit $5,394 / dwelling unit
Condo / Townhome $2,180 / dwelling unit $4,704 / dwelling unit

*Approx. Boundaries: I-205 (W), Multnomah County (N), 172nd (E) & Hwy 212 (S)


All commercial permits (including new uses, change of occupancy and tenant improvements) must provide a Statement of Use that will be reviewed by the Engineering Division (Wendi Coryell, or 503-742-4657) 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:

Note: All development in the City of Happy Valley is reviewed by city staff. For additional information, go to the City of Happy Valley website or call 503-760-3325.

Parks System Development Charge (PSDC)

The North Clackamas Park and Recreation District (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. District parks, facilities and services are important community resources benefiting both existing and future park district residents, businesses, employees and visitors.

Clackamas County has an ordinance implementing a Parks System Development Charge on any new dwelling units created within the NCPRD District.

The NCPRD recognizes the impact of business employees on the need for new capital facilities and has determined that it is in everyone’s best interests to also seek some contribution to those needs from commercial developments.

System Development Charges are one-time fees charged to new development to help pay a portion of the costs associated with building capital facilities to meet needs created by growth. The PSDC fee is based on the specific impact a development is expected to have on the District’s population and employment.

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

Type of Development
(See 'District Map' for boundaries)
Zone 2
(West of I-205 to the Willamette River)
Zone 3
(East of I-205 to Urban Growth Boundary)
Sunnyside Village
(See 'District Map' for boundaries)
Single Family Residential / Manufactured Home $6,760 $6,075 $6,075
Multi-Family $5,842 $5,290 $5,290
Non-Residential $60 / Employee ** $60 / Employee ** $60 / Employee **
** Number of employees calculated using PSDC Table 5.4, below.

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

OSHA SIC Definitions

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 (SDC rate) = $6,480

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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.

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