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3-12 over Hart Lake Overflow

Lake County, Oregon · rated Good in the 2025 National Bridge Inventory

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

3-12 over Hart Lake Overflow in Lake County, Oregon, 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 1982, making it 43 years old at the 2025 inventory.
It carries about 185 vehicles a day (traffic count year 2020).
Its listed owner is the county highway agency.
It is one of 39 of the 95 inventoried bridges in Lake County rated good (41.1%); 7 (7.4%) 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 tee beam
Length	about 74 ft
Location	053 Mi East of 3-10+ B327
NBI structure number	37C0073-1200530
Condition class	Good

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

Bridge	Built	Vehicles/day	Condition
Or 140 (hwy 020) over Goose Lake Swale	2001	2,107	Good
Or 140 (hwy 020)RW over Irrigation Canal	2001	2,107	Good
Or 140 (hwy 020) over Thomas Creek	2001	2,107	Good
Or 140 (hwy 020) over Thomas Creek	2001	2,107	Good
Or 140 (hwy 020) over Warner Canyon Creek	2001	2,107	Good
Or 140 (hwy 020) over Muddy Creek	2004	1,314	Good