US Bridges

County Road 77 over Synder Creek

Fair

Park County, Colorado · 2.9 MI SE of Jefferson · Structure no. PA77-S2.9-S285

Built
2006
19 years old
Condition
Fair
inspected April 2023
Type
Culvert
Aluminum, Wrought Iron, or Cast Iron
Length
31 ft
2 main spans
Daily traffic
352
2020 count
Owner
County
County Highway Agency

About this bridge

County Road 77 over Synder Creek is a aluminum, wrought iron, or cast iron culvert carrying County Road 77 over Synder Creek in Park County, Colorado. It was built in 2006, so it is 19 years old, younger than the Colorado average of 42.2 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 352 vehicles a day, roughly 3% of them trucks, projected to reach 471 by 2040. The structure is 31 ft (9.4 m) long and 46 ft wide. If it were closed, the detour would be 31.7 mi (51 km).

Location

Open in Google Maps
CarriesCounty Road 77
CrossesSynder Creek
Location2.9 MI SE of Jefferson
RouteCounty Highway 0
CountyPark County
StateColorado
Coordinates39.34419, -105.77378
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating70.8 US tons

Structure

Structure typeCulvert
MaterialAluminum, Wrought Iron, or Cast Iron
DeckNot applicable
Main spans2
Design loadHS 20 + Mod
Structure length31 ft (9.4 m)
Longest span13 ft (4.1 m)
Deck width46 ft (13.9 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic352 (2020)
Projected traffic471 by 2040
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed31.7 mi (51 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was County Road 77 over Synder Creek built?

It was built in 2006, making it 19 years old in 2025.

What condition is County Road 77 over Synder Creek in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in April 2023.

How much traffic does County Road 77 over Synder Creek carry?

About 352 vehicles per day (2020 count), of which roughly 3% are trucks.

How long is County Road 77 over Synder Creek?

The structure is 31 ft (9.4 m) long with a longest span of 13 ft (4.1 m) and a deck 46 ft wide.

Who owns County Road 77 over Synder Creek?

It is owned by the County Highway Agency.