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280 Street over Dog Ear Ck

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

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

280 Street over Dog Ear Ck in Tripp 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 1947 and reconstructed in 1978, making it 78 years old at the 2025 inventory.
It carries about 49 vehicles a day (traffic count year 2022).
Its listed owner is the county highway agency.
It is one of 38 of the 89 inventoried bridges in Tripp County rated fair (42.7%); 22 (24.7%) 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	Steel stringer or multi-beam girder
Length	about 30 ft
Location	1.2W & 2S Winner
NBI structure number	000000062178300
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
US018 over Dog Ear Ck	1965	3,553	Fair
US018 Ser Rd over Ck	1965	2,820	Fair
US018 over Sand Ck	1973	2,052	Fair
US018 over Ck	1973	1,803	Fair
US018 over Cottonwood Ck	1965	1,746	Fair
US018 over Big Hollow Ck	1965	1,746	Good