US Bridges

Woodland RD (CR4) over Highland Ditch

Fair

Boulder County, Colorado · 1.3 Miles East of 75th ST · Structure no. BC-4-1.3-ID

Built
1976
49 years old
Condition
Fair
inspected January 2025
Type
Culvert
Concrete
Length
25 ft
1 main span
Daily traffic
1,163
2023 count
Owner
County
County Highway Agency

About this bridge

Woodland RD (CR4) over Highland Ditch is a concrete culvert carrying Woodland RD (CR4) over Highland Ditch in Boulder County, Colorado. It was built in 1976, so it is 49 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 1,163 vehicles a day, roughly 11% of them trucks, projected to reach 1,395 by 2043. The structure is 25 ft (7.5 m) long and 32 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesWoodland RD (CR4)
CrossesHighland Ditch
Location1.3 Miles East of 75th ST
RouteCounty Highway 0
CountyBoulder County
StateColorado
Coordinates40.2323, -105.15273
Functional classRural Minor 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
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
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 rating40 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans1
Design loadHS 20
Structure length25 ft (7.5 m)
Longest span25 ft (7.5 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,163 (2023)
Projected traffic1,395 by 2043
Trucks11%
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 Woodland RD (CR4) over Highland Ditch built?

It was built in 1976, making it 49 years old in 2025.

What condition is Woodland RD (CR4) over Highland 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 January 2025.

How much traffic does Woodland RD (CR4) over Highland Ditch carry?

About 1,163 vehicles per day (2023 count), of which roughly 11% are trucks.

How long is Woodland RD (CR4) over Highland Ditch?

The structure is 25 ft (7.5 m) long with a longest span of 25 ft (7.5 m) and a deck 32 ft wide.

Who owns Woodland RD (CR4) over Highland Ditch?

It is owned by the County Highway Agency.