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SH 74 over Rock Creek

Twin Falls County, Idaho · rated Good in the 2025 National Bridge Inventory

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

SH 74 over Rock Creek in Twin Falls County, Idaho, is rated in good condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 7 (good condition) on the 0-9 scale.
It was built in 1993, making it 32 years old at the 2025 inventory.
It carries about 19,000 vehicles a day (traffic count year 2023).
Its listed owner is the state highway agency.
It is one of 14 of the 126 inventoried bridges in Twin Falls County rated good (11.1%); 5 (4.0%) 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 433 ft
Location	In Twin Falls
NBI structure number	000000000015226
Condition class	Good

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

Bridge	Built	Vehicles/day	Condition
US 93 over Perrine Coulee;bike Path	2006	33,000	Fair
US 93 over Snake River; Perrine Br.	1976	31,500	Fair
US 30 over Perrine Coulee Canal	1960	15,500	Fair
US 93 over Rock Creek	2011	15,000	Fair
STC7232;BLUE Lakes over Rock Creek	1959	11,500	Poor
US 30 over US 30/US 93 Interchange	1997	11,000	Fair