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479TH Avenue over Big Sioux River

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

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

479TH Avenue over Big Sioux River in Moody 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 1978, making it 47 years old at the 2025 inventory.
It carries about 45 vehicles a day (traffic count year 2022).
Its listed owner is the county highway agency.
It is one of 42 of the 88 inventoried bridges in Moody County rated fair (47.7%); 18 (20.5%) 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 125 ft
Location	1.4S & 8W of Ward
NBI structure number	000000051130044
Condition class	Fair

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