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Deerfield Road over Newton Fork Ck

Pennington County, South Dakota · rated Fair in the 2025 National Bridge Inventory

United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled August 20, 2026

Deerfield Road over Newton Fork Ck in Pennington County, South Dakota, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 6 (satisfactory condition) on the 0-9 scale.
It was built in 1987, making it 38 years old at the 2025 inventory.
It carries about 1,837 vehicles a day (traffic count year 2022).
Its listed owner is the county highway agency.
It is one of 206 of the 348 inventoried bridges in Pennington County rated fair (59.2%); 21 (6.0%) are rated poor.
A fair rating means the lowest-rated major component scores 5 or 6 on FHWA's 0-9 scale: some deterioration or minor section loss, but the structure is sound. It is the middle class, not a warning.

Component ratings


Structure	Prestressed concrete tee beam
Length	about 24 ft
Location	.3W & .9N Hill City
NBI structure number	000000052236392
Condition class	Fair

Source: FHWA National Bridge Inventory, 2025 data as reported by the South Dakota department of transportation.

Bridge	Built	Vehicles/day	Condition
I090 over Boxelder Ck	1994	26,980	Good
Cambell St over Ck	1964	23,179	Fair
SD079NF over St Joseph St Rcp&e RR	1964	23,179	Fair
Cambell St over Rapid Ck	1967	21,415	Fair
West Main St. over Rapid Ck	1975	20,745	Good
SD231 over Rapid Ck	1974	20,057	Fair