US Bridges

SH 12 Ml over Purgatoire River

Good

Las Animas County, Colorado · 1 MI E of Weston · Structure no. P-17-AE

Built
1986
39 years old
Condition
Good
inspected September 2024
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete Continuous
Length
169 ft
2 main spans
Daily traffic
520
2020 count
Owner
State
State Highway Agency

About this bridge

SH 12 Ml over Purgatoire River is a prestressed concrete continuous box beam or girders - single or spread carrying SH 12 Ml over Purgatoire River in Las Animas County, Colorado. It was built in 1986, so it is 39 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 520 vehicles a day, roughly 8% of them trucks, projected to reach 567 by 2040. The structure is 169 ft (51.4 m) long and 36 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesSH 12 Ml
CrossesPurgatoire River
Location1 MI E of Weston
RouteState Highway 12A
Coordinates37.13219, -104.83121
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 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 geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating72.8 US tons
Inventory rating43.7 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length169 ft (51.4 m)
Longest span82 ft (25 m)
Deck width36 ft (11.1 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic520 (2020)
Projected traffic567 by 2040
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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 SH 12 Ml over Purgatoire River built?

It was built in 1986, making it 39 years old in 2025.

What condition is SH 12 Ml over Purgatoire River 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 September 2024.

How much traffic does SH 12 Ml over Purgatoire River carry?

About 520 vehicles per day (2020 count), of which roughly 8% are trucks.

How long is SH 12 Ml over Purgatoire River?

The structure is 169 ft (51.4 m) long with a longest span of 82 ft (25 m) and a deck 36 ft wide.

Who owns SH 12 Ml over Purgatoire River?

It is owned by the State Highway Agency.