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Board approves Iowa DOT agreements for US‑20 PCC work and Southbridge interchange; county to fund right-of-way and manage local impacts
Summary
Woodbury County approved pre-construction agreements with the Iowa DOT for US‑20 and the Southbridge interchange, accepting right-of-way costs of $758,112 and an estimated project cost of about $18.15 million; the county will coordinate detours and assume certain maintenance responsibilities after construction.
Woodbury County supervisors unanimously approved a series of pre-construction agreements with the Iowa Department of Transportation covering two major projects: a Portland Cement Concrete (PCC) reconstruction on US‑20 near Moville and the Southbridge interchange project south of Sergeant Bluff.
Laura Sievers, secondary-roads engineer, said the US‑20 PCC project will remove existing pavement and install concrete from Franklin Avenue to Humboldt Avenue; the county’s estimated cost for replacing gravel approaches with concrete approaches is $72,635.64 and DOT will maintain and own the highway. Sievers said the DOT will not detour US‑20 traffic but will close county side roads temporarily and reimburse the county for any dust-control costs it hires a contractor to perform.
On the Southbridge interchange, Sievers described multiple DOT project numbers and funding streams: right-of-way acquisition is $758,112 and the county’s preliminary estimate for the remainder of the project is $18,151,883.61. The metropolitan planning organization (MPO) Siouxland pledged $2,030,000 toward the project and the county received a RISE grant contribution of up to $4,796,168 (capped at 21% of eligible costs). DOT will acquire required easements and pay for certain bridge-width additions; the county will own and maintain county roads created by the interchange and will assume snow removal and signal maintenance responsibilities after completion.
Sievers also reviewed a required public‑highway agreement with the Union Pacific Railroad for the interchange’s at-grade crossing, noting permanent easement payment of $5,000 and temporary easement payment of $2,500 and that the railroad may bill for plan review and flagging costs. Board members asked staff to coordinate detour plans with local emergency services and school districts; staff agreed to do so. The board approved the US‑20 and Southbridge pre-construction agreements and the Union Pacific agreement unanimously.
