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County Road 59 over South Platte River

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

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

County Road 59 over South Platte River in Park 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 1986, making it 39 years old at the 2025 inventory.
It carries about 239 vehicles a day (traffic count year 2020).
Its listed owner is the county highway agency.
It is one of 18 of the 55 inventoried bridges in Park County rated good (32.7%); 3 (5.5%) 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	Prestressed concrete tee beam
Length	about 36 ft
Location	NW Eleven Mi Reservoir
NBI structure number	PA59-S1.1-C92A
Condition class	Good

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

Bridge	Built	Vehicles/day	Condition
US 285 Ml over Deer Creek	1958	14,000	Fair
US 285 Ml over Middle Fk So Platte Rvr	2024	8,000	Good
US 285 Ml over Trout Creek	1937	7,200	Fair
US 285 Ml over N. Fork S. Platte River	1962	6,400	Fair
US 285 Ml over Geneva Creek	1989	6,400	Fair
US 285 Ml over N Fk South Platte Rvr	1989	5,900	Fair