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Irr I029 S over Little Minnesota Rv

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

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

Irr I029 S over Little Minnesota Rv in Roberts 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 substructure, rated 6 (satisfactory condition) on the 0-9 scale.
It was built in 1982, making it 43 years old at the 2025 inventory.
It carries about 2,570 vehicles a day (traffic count year 2024).
Its listed owner is the state highway agency.
It is one of 77 of the 158 inventoried bridges in Roberts County rated fair (48.7%); 40 (25.3%) 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	Continuous prestressed concrete stringer or multi-beam girder
Length	about 146 ft
Location	0.8 N Sd 10 & I29 Interch
NBI structure number	000000055118183
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
Irr SD010 over Ck	2019	7,072	Good
Irr SD010 over Ck	1979	6,275	Fair
458TH Avenue over Creek	1941	5,850	Fair
458TH Avenue over Creek	1941	5,850	Fair
459TH Avenue over Creek	1941	5,850	Good
Irr I029 over Big Spring Ck	1978	5,340	Fair