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State Route 299 over Rock Creek

Modoc County, California · rated Good in the 2025 National Bridge Inventory

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

State Route 299 over Rock Creek in Modoc County, California, is rated in good condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the culvert, rated 7 (good condition) on the 0-9 scale.
It was built in 1937 and reconstructed in 1991, making it 88 years old at the 2025 inventory.
It carries about 2,800 vehicles a day (traffic count year 2015).
Its listed owner is the state highway agency.
It is one of 43 of the 87 inventoried bridges in Modoc County rated good (49.4%); 1 (1.1%) 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

Component	Rating (2025)	FHWA scale meaning
Culvert	7	Good condition


Structure	Continuous concrete culvert
Length	about 29 ft
Location	02-mod-299-37.16
NBI structure number	03 0007
Condition class	Good

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

Bridge	Built	Vehicles/day	Condition
U.S. Highway 395 over North Fork Pit River	1982	4,000	Fair
U.S. Highway 395 over Parker Creek	1954	4,000	Fair
State Route 299 over Rattlesnake Creek	1980	3,000	Good
U.S. Highway 395 over South Fork Pit River	1971	2,400	Fair
U.S. Highway 395 over South Fork Pit River	1971	2,400	Good
U.S. Highway 395 over UP RR	1971	2,400	Fair