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Project Profile: Yankton County Napa Junction Service Road

Purple Line Project

photo credit: South Dakota Department of Transportation


Yankton County, South Dakota

Project Borrower / Sponsor

Yankton County

Program Areas

Value Capture

Value Capture Techniques Tax Increment Financing

Local Road


In 2015, the South Dakota Transportation Commission granted Yankton County a $6 million State Highway Fund Loan to construct a concrete industrial service road on County Road 210/437th Avenue and 307th Street, and a portion of 436th Avenue. The project connects South Dakota Highway 50 to the new Napa Junction Rail Park, an industrial/commercial development zone located around the state-owned Dakota Southern Railway and Burlington Northern Santa Fe (BNSF) Railway lines, which run north to Mitchell and points beyond and south to Sioux City and points beyond. The four-mile improvements to the service road include approximately 3.2 miles of Portland cement pavement and 0.8 mile of gravel.

To date, the service road provides access to a new $40 million Dakota Plains Ag Center 110-car shuttle train grain facility and agronomy center, as well as a new $25 million dried distillers grain facility. The shuttle train grain facility provides efficient access to rail lines that extend throughout the state, allowing farmers to ship their product across the state and country by rail, thereby removing trucks from state highways.

The service road was ineligible for Federal funding and as a result, could not take advantage of loans from the existing South Dakota State Infrastructure Bank. To build the road and catalyze development in the area, Yankton County applied for the state's first ever non-Infrastructure Bank, State Highway Fund Loan, to be repaid through a tax increment financing (TIF) district centered around the growing rail park. The rail park is located in a Yankton County opportunity zone providing other tax incentives to local businesses.

In 2017, tax increment proceeds of $125,369 fell short of the required loan payment. However, the structure of the loan agreement requires Dakota Plains Ag Center to make up the difference. It paid an additional $208,981 to Yankton County to cover the county's interest payment. As additional businesses locate to the Napa Junction Rail Park, the agricultural center's tax burden is expected to decline.


$6.2 million

Funding Sources

South Dakota DOT State Highway Fund Loan for Local Governments - $6.2 million

Project Delivery / Contract Method


Private Partner


Project Advisors / Consultants

Stockwell Engineers - Lead Designer

Midland Contracting - Grading

PCi Roads - Paving

Dougherty & Company, LLC - Financial Advisor


South Dakota Transportation Commission

Duration / Status

Construction began in August 2016

Substantial completion achieved in October 2017

Financial Status

The Tax Increment Finance District loan is financed over ten years in ten annual installments with a balloon payment. Dakota Plains Ag Center guarantees the loan for the county.

  • This TIF district was created to repay the first ever State Highway Fund Loan in South Dakota. Successful and on-time repayment could lead to an increase in State Highway Fund Loan usage across the state.
  • The Dakota Plains Ag Center is located within an "opportunity zone," which uses preferential tax treatment to spur investment in distressed communities.
Related Links / Articles

Napa Junction Rail Park

Stockwell Engineers Project Page

Yankton County TIF Article


Tammy Williams
SDDOT Program Manager - Administration
Tel: (605) 773-8149

Toby Morris
Dougherty & Company
Tel: (605) 224-5557

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