US Bridges

US 287 Ml over Lone Rock Draw

Good

Baca County, Colorado · 24 Miles North of Okla S. · Structure no. O-26-E

Built
1966
59 years old, rebuilt 2009
Condition
Good
inspected May 2024
Type
Slab
Concrete Continuous
Length
94 ft
3 main spans
Daily traffic
2,900
2020 count
Owner
State
State Highway Agency

About this bridge

US 287 Ml over Lone Rock Draw is a concrete continuous slab carrying US 287 Ml over Lone Rock Draw in Baca County, Colorado. It was built in 1966 and reconstructed in 2009, 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 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 2,900 vehicles a day, roughly 55% of them trucks, projected to reach 3,828 by 2040. The structure is 94 ft (28.7 m) long and 47 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

CarriesUS 287 Ml
CrossesLone Rock Draw
Location24 Miles North of Okla S.
RouteU.S. Route 287A
Coordinates37.32544, -102.61546
Functional classRural Principal Arterial - Other

Condition and inspection

Good

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating75.4 US tons
Inventory rating45.2 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length94 ft (28.7 m)
Longest span50 ft (15.2 m)
Deck width47 ft (14.3 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,900 (2020)
Projected traffic3,828 by 2040
Trucks55%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemYes

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 US 287 Ml over Lone Rock Draw built?

It was built in 1966, making it 59 years old in 2025. It was reconstructed in 2009.

What condition is US 287 Ml over Lone Rock Draw 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 May 2024.

How much traffic does US 287 Ml over Lone Rock Draw carry?

About 2,900 vehicles per day (2020 count), of which roughly 55% are trucks.

How long is US 287 Ml over Lone Rock Draw?

The structure is 94 ft (28.7 m) long with a longest span of 50 ft (15.2 m) and a deck 47 ft wide.

Who owns US 287 Ml over Lone Rock Draw?

It is owned by the State Highway Agency.