US Bridges

County Road 77 over Rock Creek

Good

Park County, Colorado · 9.6 MI SE of US 285 · Structure no. PA77-S9.6-S285

Built
2006
19 years old
Condition
Good
inspected April 2023
Type
Culvert
Aluminum, Wrought Iron, or Cast Iron
Length
28 ft
2 main spans
Daily traffic
350
2020 count
Owner
County
County Highway Agency

About this bridge

County Road 77 over Rock Creek is a aluminum, wrought iron, or cast iron culvert carrying County Road 77 over Rock 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 good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 350 vehicles a day, projected to reach 471 by 2040. The structure is 28 ft (8.5 m) long and 47 ft wide. If it were closed, the detour would be 70.8 mi (114 km).

Location

Open in Google Maps
CarriesCounty Road 77
CrossesRock Creek
Location9.6 MI SE of US 285
RouteCounty Highway 0
CountyPark County
StateColorado
Coordinates39.29154, -105.69736
Functional classRural Major Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert7 GoodSome minor problems.
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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating39.4 US tons
Inventory rating23.6 US tons

Structure

Structure typeCulvert
MaterialAluminum, Wrought Iron, or Cast Iron
DeckNot applicable
Main spans2
Design loadHS 20
Structure length28 ft (8.5 m)
Longest span12 ft (3.7 m)
Deck width47 ft (14.3 m)
Roadway width25 ft (7.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic350 (2020)
Projected traffic471 by 2040
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed70.8 mi (114 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 Rock Creek built?

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

What condition is County Road 77 over Rock Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in April 2023.

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

About 350 vehicles per day (2020 count).

How long is County Road 77 over Rock Creek?

The structure is 28 ft (8.5 m) long with a longest span of 12 ft (3.7 m) and a deck 47 ft wide.

Who owns County Road 77 over Rock Creek?

It is owned by the County Highway Agency.