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407TH Avenue over North Br Twelve Mile Ck

Davison County, South Dakota · rated Poor in the 2025 National Bridge Inventory

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

407TH Avenue over North Br Twelve Mile Ck in Davison County, South Dakota, is rated in poor condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the substructure, rated 4 (poor condition) on the 0-9 scale.
It was built in 1930, making it 95 years old at the 2025 inventory.
It carries about 64 vehicles a day (traffic count year 2022).
Its listed owner is the county highway agency.
It is one of 22 of the 123 inventoried bridges in Davison County rated poor (17.9%); 22 (17.9%) are rated poor.
A poor rating means at least one major component - deck, superstructure, or substructure - is rated 4 or lower on FHWA's 0-9 scale. It does not by itself mean the bridge is unsafe; bridges judged unsafe are closed or load-restricted by their owners.

Component ratings


Structure	Steel stringer or multi-beam girder
Length	about 35 ft
Location	2 W & 10.2S Mitchell
NBI structure number	000000018130202
Condition class	Poor

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

Bridge	Built	Vehicles/day	Condition
Sanborn St (SD37) over BNSF RR	2001	13,545	Fair
Sanborn St (SD37) over Dry Run Ck	2001	13,545	Good
South Burr Street over Dry Run Ck	1990	11,950	Good
SD037 over I090	1966	10,351	Fair
SD037 over Dry Run Ck	1996	9,756	Good
SD037 over 4TH Ave BNSF RR	1997	7,642	Good