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416TH Avenue over Crow Creek Ditch

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

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

416TH Avenue over Crow Creek Ditch in Marshall County, South Dakota, is rated in poor condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the substructure, rated 3 (serious condition) on the 0-9 scale.
It was built in 1935 and reconstructed in 1965, making it 90 years old at the 2025 inventory.
It carries about 35 vehicles a day (traffic count year 2022).
Its listed owner is the county highway agency.
It is one of 13 of the 38 inventoried bridges in Marshall County rated poor (34.2%); 13 (34.2%) are rated poor.
A poor rating means at least one major component - deck, superstructure, or substructure - is rated 4 or lower on FHWA's 0-9 scale. It does not by itself mean the bridge is unsafe; bridges judged unsafe are closed or load-restricted by their owners.

Component ratings


Structure	Steel stringer or multi-beam girder
Length	about 25 ft
Location	2N & 1E of Amherst
NBI structure number	000000046040115
Condition class	Poor

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