US Bridges

SH 12 Ml over Zaracillo Canyon

Fair

Las Animas County, Colorado · 5.2 MI E of Weston · Structure no. P-17-A

Built
1936
89 years old
Condition
Fair
inspected July 2024
Type
Tee Beam
Concrete
Length
117 ft
4 main spans
Daily traffic
520
2020 count
Owner
State
State Highway Agency

About this bridge

SH 12 Ml over Zaracillo Canyon is a concrete tee beam carrying SH 12 Ml over Zaracillo Canyon 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 520 vehicles a day, roughly 8% of them trucks, projected to reach 567 by 2040. The structure is 117 ft (35.7 m) long and 34 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesSH 12 Ml
CrossesZaracillo Canyon
Location5.2 MI E of Weston
RouteState Highway 12A
Coordinates37.12351, -104.76341
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating55 US tons
Inventory rating33.1 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans4
Design loadUnknown
Structure length117 ft (35.7 m)
Longest span23 ft (7 m)
Deck width34 ft (10.4 m)
Roadway width31 ft (9.3 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 statusEligible 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 Zaracillo Canyon built?

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

What condition is SH 12 Ml over Zaracillo Canyon 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 July 2024.

How much traffic does SH 12 Ml over Zaracillo Canyon carry?

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

How long is SH 12 Ml over Zaracillo Canyon?

The structure is 117 ft (35.7 m) long with a longest span of 23 ft (7 m) and a deck 34 ft wide.

Who owns SH 12 Ml over Zaracillo Canyon?

It is owned by the State Highway Agency.