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A. Concurrently with adoption of an updated Transportation Facilities Plan, the director shall prepare an updated transportation impact fee program report using the following methodology:

1. Determine the share of costs attributable to growth. For the transportation improvements listed in the impact fee project list, calculate any transportation deficiencies based upon the adopted level of service standards. Remove the proportion of the total costs of such transportation improvements attributable to deficiencies. The remaining “growth share of costs” are attributable to new growth occurring within and outside of the city.

2. Calculate the city development percentage of growth on the transportation improvements. Multiply this percentage by the total growth share of costs to determine the share of the transportation costs attributable to development in the city. This total constitutes the “city development share of cost.”

3. Divide the “city development share of cost” by the total number of p.m. peak hour vehicle trips generated by development within the city. The resulting value is the “impact fee per trip.”

4. Adjust the “impact fee per p.m. peak hour trip” for specific land use types to account for:

a. Pass-by trips, as defined in the Institute of Transportation Engineers’ Trip Generation Report, now or as hereafter amended; and

b. Average trip length; and

c. Expected levels of ridesharing and transit usage.

5. Produce a schedule of impact fee rates per development unit (e.g., square footage, housing units) for specific land use types for consideration pursuant to BCC 22.16.085.

B. The director shall calculate the amount of the applicable transportation impact fee for each development by:

1. Verifying the development land use type and units of development;

2. Determining the applicable per unit transportation impact fee from the impact fee schedule;

3. Multiplying the applicable per unit transportation impact fee by the development unit to obtain the transportation impact fee for the new development;

4. Subtracting the per unit transportation impact fee for existing use that has been present on the site within the past two years of the development’s land use application. Such fee for existing development shall be calculated in the same manner and subtracted from the fee calculated for the new development to determine the net fee for the development.

C. If the development does not fit into any of the categories specified in the transportation impact fee schedule, the director shall calculate the impact fee based on the number of trips generated by the development using the rate from the current version of the Institute of Transportation Engineers Trip Generation Manual, or other industry standard trip generation rate. If the development includes mixed uses, the fee shall be determined by apportioning the space committed to uses specified in the impact fee schedule.

D. The director shall be authorized to adjust the impact fees for any development based on analysis of specific trip-generating characteristics of the development. Such adjustments may consider mixed-use characteristics and/or expected levels of ridesharing and transit usage of the development.

E. No transportation impact fee shall be collected if the transportation improvements are incapable of being reasonably accomplished because of lack of public funds. No impact fee shall be imposed by the city on a development when mitigation for the same transportation impact of the development is being required by any other governmental agency pursuant to any other local, state, or federal law.

F. The director shall consider unusual circumstances for specific developments and shall adjust the otherwise applicable impact fee for specific developments in order to ensure that impact fees are imposed fairly. The director shall set forth his/her reasons for adjusting the impact fee in written findings.

G. Through a development agreement approved by the city council pursuant to Chapter 36.70B RCW, the impact fees calculated for a specific development may be adjusted or reduced upon a finding that the public interest is served by such adjustment and so long as any reduction of impact fees is paid from public funds other than the impact fee fund. (Ord. 6519 § 6, 2020; Ord. 6298 § 2, 2016; Ord. 5871 § 6, 2009; Ord. 4824 § 6, 1995; Ord. 4104 § 8, 1989.)