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44790 306 St over Unnamed Creek

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

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

44790 306 St over Unnamed Creek in Yankton 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 1989, making it 36 years old at the 2025 inventory.
It carries about 50 vehicles a day (traffic count year 2022).
Its listed owner is the county highway agency.
It is one of 44 of the 99 inventoried bridges in Yankton County rated fair (44.4%); 13 (13.1%) 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 35 ft
Location	2n&1.9e Mission Hill
NBI structure number	000000068199150
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
US081 over Marne Ck	1959	16,870	Fair
SD050 over Marne Ck	1971	9,753	Fair
US081 over Missouri Rv	2007	7,755	Fair
SD052 over Ck	1988	6,711	Fair
W 21ST Street over Marne Creek	1973	6,324	Good
Burleigh Street over Marne Creek	1989	4,996	Good