US Bridges

I25 Ml / Frontage over Mayne Arroyo

Fair

Huerfano County, Colorado · 5.5 MI S of SH10-WLSNBRG. · Structure no. N-18-C

Built
1965
60 years old, rebuilt 1969
Condition
Fair
inspected January 2025
Type
Culvert
Concrete
Length
26 ft
2 main spans
Daily traffic
11,000
2020 count
Owner
State
State Highway Agency

About this bridge

I25 Ml / Frontage over Mayne Arroyo is a concrete culvert carrying I25 Ml / Frontage over Mayne Arroyo in Huerfano County, Colorado. It was built in 1965 and reconstructed in 1969, so it is 60 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 6 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 11,000 vehicles a day, roughly 17% of them trucks, projected to reach 14,410 by 2040. The structure is 26 ft (7.8 m) long and 283 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesI25 Ml / Frontage
CrossesMayne Arroyo
Location5.5 MI S of SH10-WLSNBRG.
RouteInterstate 25A
CountyHuerfano County
StateColorado
Coordinates37.56023, -104.72263
Functional classRural Principal Arterial - Interstate

Condition and inspection

Fair

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

ComponentRatingMeaning
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating110.1 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadH 20
Structure length26 ft (7.8 m)
Longest span12 ft (3.7 m)
Deck width283 ft (86.3 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,000 (2020)
Projected traffic14,410 by 2040
Trucks17%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 I25 Ml / Frontage over Mayne Arroyo built?

It was built in 1965, making it 60 years old in 2025. It was reconstructed in 1969.

What condition is I25 Ml / Frontage over Mayne Arroyo 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 January 2025.

How much traffic does I25 Ml / Frontage over Mayne Arroyo carry?

About 11,000 vehicles per day (2020 count), of which roughly 17% are trucks.

How long is I25 Ml / Frontage over Mayne Arroyo?

The structure is 26 ft (7.8 m) long with a longest span of 12 ft (3.7 m) and a deck 283 ft wide.

Who owns I25 Ml / Frontage over Mayne Arroyo?

It is owned by the State Highway Agency.