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Old Highway 18 over Red Canyon Ck

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

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

Old Highway 18 over Red Canyon Ck in Fall River 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 8 (very good condition) on the 0-9 scale.
It was built in 2016, making it 9 years old at the 2025 inventory.
It carries about 50 vehicles a day (traffic count year 2022).
Its listed owner is the county highway agency.
It is one of 41 of the 80 inventoried bridges in Fall River County rated good (51.2%); 5 (6.2%) 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 162 ft
Location	2.2E Edgemont
NBI structure number	000000024135113
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 Fall Rv	2010	5,064	Fair
US018 over Fall Rv	2010	5,064	Fair
US018 over Ck	1968	4,913	Fair
US385 over Fall Rv	1998	4,898	Good
US018 over Fall Rv	1968	4,687	Fair
SD079 over Elm Ck	2006	4,214	Fair