Commissioners debate significant potential increases to transportation impact fees for warehouses; public hearing set for March 18

Polk County commissioners on March 4 held the second workshop required under state law to consider revisions to transportation impact fees for warehouse and industrial land uses. Consultants and staff reviewed local trip-generation data and several options, including applying a "blockage" factor to account for heavy-truck impacts, and presented fee scenarios that would raise the county's industrial/warehouse transportation fee from the current phased amount up to several alternatives.

Staff said local data showed higher trip lengths and truck impacts than older national ITE figures and recommended using the most recent local data where available. The consultant's weighted, localized sample produced a blended trip rate that staff presented as 2.25 trips per 1,000 square feet for warehouse, compared with the county's prior baseline of about 1.71 (the more commonly cited ITE rate). Depending on methodology and the use of a blockage adjustment, staff presented options that would increase the transportation fee by ranges from moderate to as much as about 308% for the highest option in the presentation. Staff noted state law (the "extraordinary circumstances" provisions) restricts how often and how much fees can be increased without the required studies and workshops, and explained the ordinance would need a 4-of-5 vote to enact an increase under the extraordinary-circumstances path.

A large public comment segment followed, with representatives from the local economic-development community, developers and logistics-industry advocates questioning study choices. Key concerns included use of a small sample of warehouses that included outliers (FedEx, other large fulfillment centers) that skew average trip rates and a reported increase in average trip length from roughly 5 miles in prior Polk studies to 10+ miles in the new analysis based largely on several high-volume outliers. Stakeholders said they support accounting for high-impact outliers but urged caution about setting a countywide fee that would apply equally to smaller local warehouses and distribution operations.

Several commissioners expressed appreciation for the staff work but said they were not prepared to support the highest-fee options and asked for more information: comparative, real-world construction costs for area road improvements, clarification of the blockage methodology and geographic representativeness of the consultant sample (many sample sites clustered along the I-4 corridor). Staff said the next step is a public hearing on March 18 that will present all five ordinance options for a vote; if the board cannot secure four votes in favor of any increase, no change will occur. Staff noted the adopted timeline would include a 90-day phase-in before any new fee becomes effective.

No final fee decision was made at the workshop; the board will hear the ordinance and hold the public hearing March 18. Staff and the consultant said applicants may submit independent traffic studies to justify a lower fee in individual cases.