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Nfsr 770.1 over S. Fork Mighigan River

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

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

Nfsr 770.1 over S. Fork Mighigan River in Jackson 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 1966 and reconstructed in 1982, making it 59 years old at the 2025 inventory.
It carries about 17 vehicles a day (traffic count year 2018).
It is one of 13 of the 47 inventoried bridges in Jackson County rated good (27.7%); 2 (4.3%) 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	Timber stringer or multi-beam girder
Length	about 23 ft
Location	4.5 Mi. S. of S.H. 14
NBI structure number	020604000001090
Condition class	Good

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

Bridge	Built	Vehicles/day	Condition
SH 125 Ml over Michigan River	2012	2,400	Good
SH 125 Ml over Illinois River	1993	2,200	Good
SH 14 Ml over Grizzly Creek	1949	1,300	Fair
SH 14 Ml over Grizzly Creek	1950	1,300	Fair
SH 14 Ml over Colorado Creek	1949	1,300	Fair
SH 14 Ml over Arapahoe Creek	1950	1,300	Fair