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306 Avenue over Keyapaha Rv

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

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

306 Avenue over Keyapaha Rv in Tripp County, South Dakota, is rated in good condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 9 (excellent condition) on the 0-9 scale.
It was built in 2024, making it 1 years old at the 2025 inventory.
It carries about 150 vehicles a day (traffic count year 2022).
Its listed owner is the county highway agency.
It is one of 29 of the 89 inventoried bridges in Tripp County rated good (32.6%); 22 (24.7%) are rated poor.
A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.

Component ratings


Structure	Prestressed concrete stringer or multi-beam girder
Length	about 89 ft
Location	4.3S & 1W Clearfield
NBI structure number	000000062100463
Condition class	Good

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