US Bridges

Mountain Drive over N Fork S Platte River

Fair

Park County, Colorado · S of Bellford Mtn Heights · Structure no. PA853-0.1-S285

Built
1977
48 years old
Condition
Fair
inspected April 2023
Type
Tee Beam
Prestressed Concrete
Length
53 ft
1 main span
Daily traffic
143
2020 count
Owner
County
County Highway Agency

About this bridge

Mountain Drive over N Fork S Platte River is a prestressed concrete tee beam carrying Mountain Drive over N Fork S Platte River in Park County, Colorado. It was built in 1977, so it is 48 years old, older 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 143 vehicles a day, projected to reach 192 by 2040. The structure is 53 ft (16.2 m) long and 24 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesMountain Drive
CrossesN Fork S Platte River
LocationS of Bellford Mtn Heights
RouteCounty Highway 0
CountyPark County
StateColorado
Coordinates39.44375, -105.60978
Functional classRural Local

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating40 US tons
Inventory rating36 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length53 ft (16.2 m)
Longest span50 ft (15.2 m)
Deck width24 ft (7.4 m)
Roadway width24 ft (7.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic143 (2020)
Projected traffic192 by 2040
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 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 Mountain Drive over N Fork S Platte River built?

It was built in 1977, making it 48 years old in 2025.

What condition is Mountain Drive over N Fork S Platte River 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 Mountain Drive over N Fork S Platte River carry?

About 143 vehicles per day (2020 count).

How long is Mountain Drive over N Fork S Platte River?

The structure is 53 ft (16.2 m) long with a longest span of 50 ft (15.2 m) and a deck 24 ft wide.

Who owns Mountain Drive over N Fork S Platte River?

It is owned by the County Highway Agency.