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300 Avenue over Sand Ck

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

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

300 Avenue over Sand Ck in Tripp 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 superstructure, rated 4 (poor condition) on the 0-9 scale.
It was built in 1965, making it 60 years old at the 2025 inventory.
It carries about 29 vehicles a day (traffic count year 2022).
Its listed owner is the county highway agency.
It is one of 22 of the 89 inventoried bridges in Tripp County rated poor (24.7%); 22 (24.7%) 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	Timber stringer or multi-beam girder
Length	about 32 ft
Location	1.4W & 2.1S Keyapaha
NBI structure number	000000062040481
Condition class	Poor

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