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Csah 4 over Big Cobb River

Blue Earth County, Minnesota · rated Poor in the 2025 National Bridge Inventory

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

Csah 4 over Big Cobb River in Blue Earth County, Minnesota, is rated in poor condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the superstructure, rated 4 (poor condition) on the 0-9 scale.
It was built in 1963, making it 62 years old at the 2025 inventory.
It carries about 253 vehicles a day (traffic count year 2021).
Its listed owner is the county highway agency.
It is one of 12 of the 193 inventoried bridges in Blue Earth County rated poor (6.2%); 12 (6.2%) 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	Prestressed concrete channel beam
Length	about 93 ft
Location	0.1 Mi N of Jct CR 164
NBI structure number	07509
Condition class	Poor

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

Bridge	Built	Vehicles/day	Condition
US 14 over Minn River; Trail	1976	39,000	Fair
US 14 over Th 169	1976	39,000	Fair
US 169 over Minn R UP RR; Str	1960	34,432	Fair
US 169 over Sibley St	1992	23,523	Fair
US 169 over Off Ramp From US 169	1987	23,523	Fair
Unu 169 over Minn R UP RR; Street	1985	22,949	Poor