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Swanson Road over Yankee Slough Overflow

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

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

Swanson Road over Yankee Slough Overflow in Sutter County, California, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 5 (fair condition) on the 0-9 scale.
It was built in 1934, making it 91 years old at the 2025 inventory.
It carries about 963 vehicles a day (traffic count year 2015).
Its listed owner is the county highway agency.
It is one of 64 of the 121 inventoried bridges in Sutter County rated fair (52.9%); 16 (13.2%) 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


Structure	Continuous steel stringer or multi-beam girder
Length	about 76 ft
Location	1.95 Mi Ne/o SH 70
NBI structure number	18C0053
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
5TH Street over Feather River	2019	67,000	Good
5TH Street over 2ND Street Sutter Street	2019	67,000	Good
State Route 20 over Feather River K St UP RR	1947	48,000	Fair
State Route 20 over Abandoned UP RR Spur	1946	41,750	Good
State Route 20 over Sutter Street	1946	41,750	Good
State Route 99 SB over Cross Canal	1949	18,750	Fair