US Bridges

County Road 26 over Left Hand Creek

Good

Boulder County, Colorado · 0.6 MI W of CO RD 33 · Structure no. BC-26-5.3-LT1

Built
1991
34 years old
Condition
Good
inspected February 2025
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete
Length
60 ft
1 main span
Daily traffic
121
2022 count
Owner
County
County Highway Agency

About this bridge

County Road 26 over Left Hand Creek is a prestressed concrete box beam or girders - single or spread carrying County Road 26 over Left Hand Creek in Boulder County, Colorado. It was built in 1991, so it is 34 years old, younger 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 121 vehicles a day, roughly 10% of them trucks, projected to reach 145 by 2042. The structure is 60 ft (18.3 m) long and 35 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesCounty Road 26
CrossesLeft Hand Creek
Location0.6 MI W of CO RD 33
RouteCounty Highway 0
CountyBoulder County
StateColorado
Coordinates40.1125, -105.19514
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionFebruary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation8: Equal to present desirable criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60.3 US tons
Inventory rating36 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length60 ft (18.3 m)
Longest span54 ft (16.4 m)
Deck width35 ft (10.7 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic121 (2022)
Projected traffic145 by 2042
Trucks10%
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

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was County Road 26 over Left Hand Creek built?

It was built in 1991, making it 34 years old in 2025.

What condition is County Road 26 over Left Hand 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 February 2025.

How much traffic does County Road 26 over Left Hand Creek carry?

About 121 vehicles per day (2022 count), of which roughly 10% are trucks.

How long is County Road 26 over Left Hand Creek?

The structure is 60 ft (18.3 m) long with a longest span of 54 ft (16.4 m) and a deck 35 ft wide.

Who owns County Road 26 over Left Hand Creek?

It is owned by the County Highway Agency.