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420TH Avenue over Crow Creek

Marshall County, South Dakota · rated Fair in the 2025 National Bridge Inventory

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

420TH Avenue over Crow Creek in Marshall County, South Dakota, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the substructure, rated 6 (satisfactory condition) on the 0-9 scale.
It was built in 1981, making it 44 years old at the 2025 inventory.
It carries about 57 vehicles a day (traffic count year 2022).
Its listed owner is the county highway agency.
It is one of 18 of the 38 inventoried bridges in Marshall County rated fair (47.4%); 13 (34.2%) 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	Prestressed concrete tee beam
Length	about 60 ft
Location	3.6S 3.0W of Britton
NBI structure number	000000046080136
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
SD010 over Crow Ck	1942	1,344	Fair
SD010 over Drainage Ditch	1948	945	Fair
Irr SD010 over Clear Lake Inlet	1993	692	Good
SD027 over Trib Spain Ditch	1959	613	Fair
SD027 over Dry Run Ck	1980	601	Fair
SD027 over Ck	1980	601	Fair