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487TH Avenue over Flandreau Creek

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

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

487TH Avenue over Flandreau Creek in Moody 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 3 (serious condition) on the 0-9 scale.
It was built in 1982, making it 43 years old at the 2025 inventory.
It carries about 15 vehicles a day (traffic count year 2022).
Its listed owner is the county highway agency.
It is one of 18 of the 88 inventoried bridges in Moody County rated poor (20.5%); 18 (20.5%) 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 57 ft
Location	1.7N & 6E of Flandreau
NBI structure number	000000051210083
Condition class	Poor

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

Bridge	Built	Vehicles/day	Condition
I029 S over 243 St	1963	10,190	Fair
I029 N over 243 St	1963	10,190	Fair
I029 S over 238 St	1963	10,030	Fair
I029 S over Bachelor Ck	1964	10,030	Fair
I029 N over 238 St	1963	10,030	Fair
I029 N over Bachelor Ck	1964	10,030	Fair