US Bridges

SH 1 Ml over Larimer CO Canal

Fair

Larimer County, Colorado · 2.2 MI N of Ft Collins · Structure no. B-16-AL

Built
1911
114 years old, rebuilt 1934
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
36 ft
1 main span
Daily traffic
7,900
2020 count
Owner
State
State Highway Agency

About this bridge

SH 1 Ml over Larimer CO Canal is a steel stringer/multi-beam or girder carrying SH 1 Ml over Larimer CO Canal in Larimer County, Colorado. It was built in 1911 and reconstructed in 1934, so it is 114 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 7,900 vehicles a day, roughly 3% of them trucks, projected to reach 11,060 by 2040. The structure is 36 ft (11.1 m) long and 33 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesSH 1 Ml
CrossesLarimer CO Canal
Location2.2 MI N of Ft Collins
RouteState Highway 1A
CountyLarimer County
StateColorado
Coordinates40.64448, -105.07352
Functional classUrban 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 protection7 GoodSome minor problems.
Last inspectionMarch 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 geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating23 US tons
Inventory rating13.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length36 ft (11.1 m)
Longest span33 ft (10 m)
Deck width33 ft (10.2 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,900 (2020)
Projected traffic11,060 by 2040
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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$67,000
NavigationNo navigation control on waterway

Frequently asked questions

When was SH 1 Ml over Larimer CO Canal built?

It was built in 1911, making it 114 years old in 2025. It was reconstructed in 1934.

What condition is SH 1 Ml over Larimer CO Canal 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 March 2023.

How much traffic does SH 1 Ml over Larimer CO Canal carry?

About 7,900 vehicles per day (2020 count), of which roughly 3% are trucks.

How long is SH 1 Ml over Larimer CO Canal?

The structure is 36 ft (11.1 m) long with a longest span of 33 ft (10 m) and a deck 33 ft wide.

Who owns SH 1 Ml over Larimer CO Canal?

It is owned by the State Highway Agency.