US Bridges

SH 12 Ml over Burro River

Fair

Las Animas County, Colorado · 4.7 MI E of Segundo · Structure no. P-18-L

Built
1936
89 years old
Condition
Fair
inspected September 2024
Type
Arch - Deck
Steel
Length
62 ft
3 main spans
Daily traffic
1,500
2020 count
Owner
State
State Highway Agency

About this bridge

SH 12 Ml over Burro River is a steel arch - deck carrying SH 12 Ml over Burro River in Las Animas County, Colorado. It was built in 1936, so it is 89 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 1,500 vehicles a day, roughly 8% of them trucks, projected to reach 1,845 by 2040. The structure is 62 ft (18.9 m) long and 34 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesSH 12 Ml
CrossesBurro River
Location4.7 MI E of Segundo
RouteState Highway 12A
Coordinates37.12434, -104.64876
Functional classRural Major Collector

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating106.8 US tons
Inventory rating106.8 US tons

Structure

Structure typeArch - Deck
MaterialSteel
DeckOther
Main spans3
Design loadHL 93
Structure length62 ft (18.9 m)
Longest span17 ft (5.1 m)
Deck width34 ft (10.4 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,500 (2020)
Projected traffic1,845 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 statusListed on 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 Burro River built?

It was built in 1936, making it 89 years old in 2025.

What condition is SH 12 Ml over Burro 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 September 2024.

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

About 1,500 vehicles per day (2020 count), of which roughly 8% are trucks.

How long is SH 12 Ml over Burro River?

The structure is 62 ft (18.9 m) long with a longest span of 17 ft (5.1 m) and a deck 34 ft wide.

Who owns SH 12 Ml over Burro River?

It is owned by the State Highway Agency.