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County Road 77 over Synder Creek

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

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

County Road 77 over Synder Creek in Park County, Colorado, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the culvert, rated 6 (satisfactory condition) on the 0-9 scale.
It was built in 2006, making it 19 years old at the 2025 inventory.
It carries about 352 vehicles a day (traffic count year 2020).
Its listed owner is the county highway agency.
It is one of 34 of the 55 inventoried bridges in Park County rated fair (61.8%); 3 (5.5%) are rated poor.
A fair rating means the lowest-rated major component scores 5 or 6 on FHWA's 0-9 scale: some deterioration or minor section loss, but the structure is sound. It is the middle class, not a warning.

Component ratings

Component	Rating (2025)	FHWA scale meaning
Culvert	6	Satisfactory condition

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