US Bridges

SH 1 Ml over Box Elder Creek

Good

Larimer County, Colorado · In Wellington · Structure no. B-16-AN

Built
1968
57 years old
Condition
Good
inspected May 2023
Type
Tee Beam
Prestressed Concrete
Length
90 ft
1 main span
Daily traffic
5,200
2020 count
Owner
State
State Highway Agency

About this bridge

SH 1 Ml over Box Elder Creek is a prestressed concrete tee beam carrying SH 1 Ml over Box Elder Creek in Larimer County, Colorado. It was built in 1968, so it is 57 years old, older 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 5,200 vehicles a day, roughly 6% of them trucks, projected to reach 6,916 by 2040. The structure is 90 ft (27.4 m) long and 46 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesSH 1 Ml
CrossesBox Elder Creek
LocationIn Wellington
RouteState Highway 1A
Coordinates40.70389, -105.00922
Functional classUrban 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 inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating50.2 US tons
Inventory rating17.3 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length90 ft (27.4 m)
Longest span86 ft (26.2 m)
Deck width46 ft (14.1 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,200 (2020)
Projected traffic6,916 by 2040
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 1 Ml over Box Elder Creek built?

It was built in 1968, making it 57 years old in 2025.

What condition is SH 1 Ml over Box Elder Creek 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 May 2023.

How much traffic does SH 1 Ml over Box Elder Creek carry?

About 5,200 vehicles per day (2020 count), of which roughly 6% are trucks.

How long is SH 1 Ml over Box Elder Creek?

The structure is 90 ft (27.4 m) long with a longest span of 86 ft (26.2 m) and a deck 46 ft wide.

Who owns SH 1 Ml over Box Elder Creek?

It is owned by the State Highway Agency.