US Bridges

County Road 129 over I 70 Ml SR

Fair

Garfield County, Colorado · W End of Glenwood Canyon · Structure no. F-07-P

Built
1966
59 years old
Condition
Fair
inspected August 2024
Type
Tee Beam
Concrete Continuous
Length
157 ft
4 main spans
Daily traffic
2,851
2023 count
Owner
State
State Highway Agency

About this bridge

County Road 129 over I 70 Ml SR is a concrete continuous tee beam carrying County Road 129 over I 70 Ml SR in Garfield County, Colorado. It was built in 1966, so it is 59 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 5 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 2,851 vehicles a day, roughly 15% of them trucks, projected to reach 3,621 by 2042. The structure is 157 ft (48 m) long and 28 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesCounty Road 129
CrossesI 70 Ml SR
LocationW End of Glenwood Canyon
RouteCounty Highway 0
CountyGarfield County
StateColorado
Coordinates39.5609, -107.29336
Functional classUrban 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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating53 US tons
Inventory rating31 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length157 ft (48 m)
Longest span48 ft (14.5 m)
Deck width28 ft (8.5 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,851 (2023)
Projected traffic3,621 by 2042
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 129 over I 70 Ml SR built?

It was built in 1966, making it 59 years old in 2025.

What condition is County Road 129 over I 70 Ml SR 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 August 2024.

How much traffic does County Road 129 over I 70 Ml SR carry?

About 2,851 vehicles per day (2023 count), of which roughly 15% are trucks.

How long is County Road 129 over I 70 Ml SR?

The structure is 157 ft (48 m) long with a longest span of 48 ft (14.5 m) and a deck 28 ft wide.

Who owns County Road 129 over I 70 Ml SR?

It is owned by the State Highway Agency.