US Bridges

Pearl Parkway over Left Hand Ditch

Fair

Boulder County, Colorado · 500 Ft W of Foothills Pky · Structure no. BOLD-34-PEARLPW

Built
1981
44 years old
Condition
Fair
inspected February 2025
Type
Culvert
Concrete
Length
34 ft
3 main spans
Daily traffic
24,744
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Pearl Parkway over Left Hand Ditch is a concrete culvert carrying Pearl Parkway over Left Hand Ditch in Boulder County, Colorado. It was built in 1981, so it is 44 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 6 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 24,744 vehicles a day, roughly 9% of them trucks, projected to reach 29,693 by 2042. The structure is 34 ft (10.4 m) long and 101 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesPearl Parkway
CrossesLeft Hand Ditch
Location500 Ft W of Foothills Pky
RouteCity Street 0
CountyBoulder County
StateColorado
Coordinates40.02324, -105.24975
Functional classUrban Other Principal Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating40 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadHS 20
Structure length34 ft (10.4 m)
Longest span13 ft (3.9 m)
Deck width101 ft (30.9 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic24,744 (2023)
Projected traffic29,693 by 2042
Trucks9%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Pearl Parkway over Left Hand Ditch built?

It was built in 1981, making it 44 years old in 2025.

What condition is Pearl Parkway over Left Hand Ditch 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 February 2025.

How much traffic does Pearl Parkway over Left Hand Ditch carry?

About 24,744 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is Pearl Parkway over Left Hand Ditch?

The structure is 34 ft (10.4 m) long with a longest span of 13 ft (3.9 m) and a deck 101 ft wide.

Who owns Pearl Parkway over Left Hand Ditch?

It is owned by the City or Municipal Highway Agency.