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30830 405TH Ave over Trib. to Choteau Creek

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

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

30830 405TH Ave over Trib. to Choteau Creek in Bon Homme 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 deck, rated 4 (poor condition) on the 0-9 scale.
It was built in 1935, making it 90 years old at the 2025 inventory.
It carries about 60 vehicles a day (traffic count year 2022).
Its listed owner is the county highway agency.
It is one of 34 of the 126 inventoried bridges in Bon Homme County rated poor (27.0%); 34 (27.0%) 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 34 ft
Location	6.3 S 1 W Avon
NBI structure number	000000005040173
Condition class	Poor

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

Bridge	Built	Vehicles/day	Condition
SD050 over Drainage Ditch	1955	2,674	Good
SD050 over Snatch Ck	1956	2,649	Fair
SD050 over Charley Ck	1979	2,510	Good
SD050 over West Br Emanuel Ck	1960	2,498	Fair
SD050 over Emanuel Ck	1960	2,498	Fair
SD037 over Unnamed Ck	2019	1,604	Good