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29710 445TH Avenue over Clay Creek

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

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

29710 445TH Avenue over Clay Creek in Yankton County, South Dakota, is rated in good condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 8 (very good condition) on the 0-9 scale.
It was built in 2019, making it 6 years old at the 2025 inventory.
It carries about 33 vehicles a day (traffic count year 2022).
Its listed owner is the county highway agency.
It is one of 42 of the 99 inventoried bridges in Yankton County rated good (42.4%); 13 (13.1%) 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	Steel stringer or multi-beam girder
Length	about 49 ft
Location	0.1S & 7W of Irene
NBI structure number	000000068170061
Condition class	Good

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