US Bridges

Oxford RD (cr 26) over Boulder Feeder Ditch

Fair

Boulder County, Colorado · 0.3 MI W of CO RD 41 · Structure no. BC-26-4.1-ID

Built
1950
75 years old, rebuilt 1985
Condition
Fair
inspected February 2025
Type
Stringer/Multi-beam or Girder
Steel
Length
29 ft
1 main span
Daily traffic
422
2022 count
Owner
County
County Highway Agency

About this bridge

Oxford RD (cr 26) over Boulder Feeder Ditch is a steel stringer/multi-beam or girder carrying Oxford RD (cr 26) over Boulder Feeder Ditch in Boulder County, Colorado. It was built in 1950 and reconstructed in 1985, so it is 75 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 422 vehicles a day, roughly 21% of them trucks, projected to reach 506 by 2042. The structure is 29 ft (8.9 m) long and 28 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesOxford RD (cr 26)
CrossesBoulder Feeder Ditch
Location0.3 MI W of CO RD 41
RouteCounty Highway 0
CountyBoulder County
StateColorado
Coordinates40.11612, -105.2134
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
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 evaluation4: Meets minimum tolerable limits to be 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 rating24.7 US tons
Inventory rating14.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckCorrugated steel
Main spans1
Design loadHS 20
Structure length29 ft (8.9 m)
Longest span27 ft (8.1 m)
Deck width28 ft (8.6 m)
Roadway width28 ft (8.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic422 (2022)
Projected traffic506 by 2042
Trucks21%
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 Oxford RD (cr 26) over Boulder Feeder Ditch built?

It was built in 1950, making it 75 years old in 2025. It was reconstructed in 1985.

What condition is Oxford RD (cr 26) 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 Oxford RD (cr 26) over Boulder Feeder Ditch carry?

About 422 vehicles per day (2022 count), of which roughly 21% are trucks.

How long is Oxford RD (cr 26) over Boulder Feeder Ditch?

The structure is 29 ft (8.9 m) long with a longest span of 27 ft (8.1 m) and a deck 28 ft wide.

Who owns Oxford RD (cr 26) over Boulder Feeder Ditch?

It is owned by the County Highway Agency.