Industrial Park

The Port of Columbia’s Rock Hill Industrial Park is located on the west end of Dayton adjacent to Highway 12 and is home to 14 businesses. Currently the Industrial Park has limited vacant industrial building space, but has an available office building as well as ample vacant land for Build-to-Suit options.

Vacant lots:

Tracts U, and V in the Rock Hill Industrial Tract are undeveloped.
See the Available Industrial Sites and Buildings page for details.

Industrial Park Properties

Dayton Tractor and Machine
Maintenance, repair service, and parts for everything from personal automobiles and smaller service vehicles to large agriculture and construction machinery.
36710 Highway 12, Dayton

Desperado Cowboy Bullets
Manufactures lead bullets for cowboy action shooting
2 Port Way, Dayton

Industrial Building #1:

Bay 1:

Dan’s Tool Truck
3 Port Way, Dayton

Bay 2 & 3:

Gemmell’s Machine Works
Machine shop, municipal diving service, well pump service.
4 & 5 Port Way, Dayton

Industrial Building #2

USDA/FSA/NRCS – Dayton Field Office 

531 Cameron St, Dayton


Industrial Building #3

Jay’s Garage
527 Cameron St, Dayton
To schedule an appointment call 509-382-3078 or email Jay’s Garage at

Industrial Building #4

TEMA, Inc.
Trucking company and equipment sales; transporting grain, lumber, aqua fertilizer, refrigerated foods, and crop seeds (corn, beans, peas, and wheat).
409 Cameron St, Dayton

Industrial Building #5

Provides wind turbine maintenance service for the Columbia County Hopkins Ridge and Marengo wind projects
517 Cameron St, Dayton

Embee Miche
Hair & Beauty Supply
521 Cameron St, Dayton

Industrial Building #6

Columbia County Public Transportation
Public transportation authority serving Dayton and the surrounding area. Daily bus service to Walla Walla and van pools to local large employment centers.
507 Cameron St, Dayton

Walla Walla Farmers Co-op
Agricultural chemical sales.
509 Cameron St, Dayton

Office Building #2

Port of Columbia Main Office
Special purpose government with an economic development focus.
1 Port Way, Dayton

East Rear Office:
Kuhlmann Financial Services
Accounting and financial planning
1 Port Way, Dayton

West Front Office:
RAD Rubenser Driving School
Certified Driver’s Education
1 Port Way, Dayton

Office Building #3

Walla Walla Juvenile Justice Center
533 Cameron
Dayton, WA 99328
509-382-2200 – Dayton
509-524-2800 – Walla Walla

Columbia County District Court
535 Cameron
PO Box 31
Dayton, WA 99328
Hours: Monday-Friday