US Bridges

SH 231 Ml over Arkansas River

Fair

Pueblo County, Colorado · 1.5 MI N of US 50 Bus.Vin · Structure no. K-19-A

Built
1965
60 years old, rebuilt 2017
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
604 ft
8 main spans
Daily traffic
1,700
2020 count
Owner
State
State Highway Agency

About this bridge

SH 231 Ml over Arkansas River is a steel continuous stringer/multi-beam or girder carrying SH 231 Ml over Arkansas River in Pueblo County, Colorado. It was built in 1965 and reconstructed in 2017, 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 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 1,700 vehicles a day, roughly 9% of them trucks, projected to reach 1,904 by 2040. The structure is 604 ft (184.1 m) long and 35 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesSH 231 Ml
CrossesArkansas River
Location1.5 MI N of US 50 Bus.Vin
RouteState Highway 231A
Coordinates38.26588, -104.45765
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation4: Meets minimum tolerable limits to be 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 rating22.5 US tons
Inventory rating17.5 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans8
Design loadHS 20
Structure length604 ft (184.1 m)
Longest span82 ft (25 m)
Deck width35 ft (10.7 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,700 (2020)
Projected traffic1,904 by 2040
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$1 million
NavigationNo navigation control on waterway

Frequently asked questions

When was SH 231 Ml over Arkansas River built?

It was built in 1965, making it 60 years old in 2025. It was reconstructed in 2017.

What condition is SH 231 Ml over Arkansas 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 July 2024.

How much traffic does SH 231 Ml over Arkansas River carry?

About 1,700 vehicles per day (2020 count), of which roughly 9% are trucks.

How long is SH 231 Ml over Arkansas River?

The structure is 604 ft (184.1 m) long with a longest span of 82 ft (25 m) and a deck 35 ft wide.

Who owns SH 231 Ml over Arkansas River?

It is owned by the State Highway Agency.