US Bridges

Laredo Street over Highline Canal

Poor

Adams County, Colorado · .25 MI N of Colfax · Structure no. AUR04.6-K.0

Built
1970
55 years old
Condition
Poor
inspected October 2023
Type
Tee Beam
Prestressed Concrete
Length
25 ft
1 main span
Daily traffic
5,975
2021 count
Owner
City
City or Municipal Highway Agency

About this bridge

Laredo Street over Highline Canal is a prestressed concrete tee beam carrying Laredo Street over Highline Canal in Adams County, Colorado. It was built in 1970, so it is 55 years old, older than the Colorado average of 42.2 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 5,975 vehicles a day, roughly 2% of them trucks, projected to reach 7,767 by 2041. The structure is 25 ft (7.6 m) long and 52 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesLaredo Street
CrossesHighline Canal
Location.25 MI N of Colfax
RouteCity Street 0
Coordinates39.74254, -104.80041
Functional classUrban Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, 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 inspectionOctober 2023
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 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 rating36 US tons
Inventory rating27 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length25 ft (7.6 m)
Longest span21 ft (6.5 m)
Deck width52 ft (15.9 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,975 (2021)
Projected traffic7,767 by 2041
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 Laredo Street over Highline Canal built?

It was built in 1970, making it 55 years old in 2025.

What condition is Laredo Street over Highline Canal in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in October 2023.

How much traffic does Laredo Street over Highline Canal carry?

About 5,975 vehicles per day (2021 count), of which roughly 2% are trucks.

How long is Laredo Street over Highline Canal?

The structure is 25 ft (7.6 m) long with a longest span of 21 ft (6.5 m) and a deck 52 ft wide.

Who owns Laredo Street over Highline Canal?

It is owned by the City or Municipal Highway Agency.