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Martin St over Forbes Creek

Lake County, California · rated Fair in the 2025 National Bridge Inventory

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

Martin St over Forbes Creek in Lake County, California, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the culvert, rated 6 (satisfactory condition) on the 0-9 scale.
It was built in 1970, making it 55 years old at the 2025 inventory.
It carries about 1,046 vehicles a day (traffic count year 2008).
Its listed owner is a city or municipal highway agency.
It is one of 79 of the 131 inventoried bridges in Lake County rated fair (60.3%); 12 (9.2%) are rated poor.
A fair rating means the lowest-rated major component scores 5 or 6 on FHWA's 0-9 scale: some deterioration or minor section loss, but the structure is sound. It is the middle class, not a warning.

Component ratings

Component	Rating (2025)	FHWA scale meaning
Culvert	6	Satisfactory condition


Structure	Continuous concrete culvert
Length	about 27 ft
Location	0.6 Mi East of SR 29
NBI structure number	14C0066
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
State Route 53 over Seigler Creek	1952	16,500	Fair
State Route 29 over Kelsey Creek	1966	12,100	Good
State Route 29 over Adobe Creek	1966	12,100	Good
State Route 29 over Hill Creek	1966	12,100	Good
State Route 29 over Manning Creek	1966	12,100	Good
State Route 29 over Putah Creek	2003	10,900	Good