US Bridges

Prospect Road CR24 over Boulder Feeder Ditch

Fair

Boulder County, Colorado · 0.3 MI E of CO RD 57 · Structure no. BC-24-0.3-ID1

Built
1988
37 years old
Condition
Fair
inspected February 2025
Type
Frame
Concrete
Length
32 ft
1 main span
Daily traffic
180
2023 count
Owner
County
County Highway Agency

About this bridge

Prospect Road CR24 over Boulder Feeder Ditch is a concrete frame carrying Prospect Road CR24 over Boulder Feeder Ditch in Boulder County, Colorado. It was built in 1988, so it is 37 years old, younger 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 180 vehicles a day, roughly 15% of them trucks, projected to reach 216 by 2043. The structure is 32 ft (9.7 m) long and 30 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesProspect Road CR24
CrossesBoulder Feeder Ditch
Location0.3 MI E of CO RD 57
RouteCounty Highway 0
CountyBoulder County
StateColorado
Coordinates40.13423, -105.2198
Functional classRural Local

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
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
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60.5 US tons
Inventory rating45.5 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckOther
Main spans1
Design loadHS 20
Structure length32 ft (9.7 m)
Longest span28 ft (8.6 m)
Deck width30 ft (9.2 m)
Roadway width29 ft (8.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic180 (2023)
Projected traffic216 by 2043
Trucks15%
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

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 Prospect Road CR24 over Boulder Feeder Ditch built?

It was built in 1988, making it 37 years old in 2025.

What condition is Prospect Road CR24 over Boulder Feeder 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 Prospect Road CR24 over Boulder Feeder Ditch carry?

About 180 vehicles per day (2023 count), of which roughly 15% are trucks.

How long is Prospect Road CR24 over Boulder Feeder Ditch?

The structure is 32 ft (9.7 m) long with a longest span of 28 ft (8.6 m) and a deck 30 ft wide.

Who owns Prospect Road CR24 over Boulder Feeder Ditch?

It is owned by the County Highway Agency.