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SH 55 Ml over South Platte River

Logan County, Colorado · rated Good in the 2025 National Bridge Inventory

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

SH 55 Ml over South Platte River in Logan County, Colorado, is rated in good condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 7 (good condition) on the 0-9 scale.
It was built in 1987, making it 38 years old at the 2025 inventory.
It carries about 460 vehicles a day (traffic count year 2020).
Its listed owner is the state highway agency.
It is one of 69 of the 182 inventoried bridges in Logan County rated good (37.9%); 16 (8.8%) 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	Continuous steel stringer or multi-beam girder
Length	about 180 ft
Location	1.3 Mi S of Jct Sh55+us13
NBI structure number	A-25-AS
Condition class	Good

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

Bridge	Built	Vehicles/day	Condition
US 6 Ml over City Streets UP RR	1972	9,900	Fair
US 6 Ml over South Platte R Ovflw	1957	9,900	Fair
US 6 Ml over Henderson-smith Ditch	1965	9,900	Fair
US 6 Ml over South Platte River	1957	9,900	Fair
US 6 Ml over South Platte R Ovflw	1957	9,900	Fair
I 76 Ml Wbnd over Twenty Two Slough	1964	5,500	Fair