US Bridges

Deerwood Drive over Oligarchy Ditch

Fair

Boulder County, Colorado · 20 Ft W of CO RD 1 · Structure no. LONG-DRWD-SMRHK

Built
2000
25 years old
Condition
Fair
inspected January 2025
Type
Culvert
Concrete
Length
25 ft
2 main spans
Daily traffic
1,709
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Deerwood Drive over Oligarchy Ditch is a concrete culvert carrying Deerwood Drive over Oligarchy Ditch in Boulder County, Colorado. It was built in 2000, so it is 25 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 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 1,709 vehicles a day, roughly 5% of them trucks, projected to reach 2,050 by 2043. The structure is 25 ft (7.6 m) long and 63 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesDeerwood Drive
CrossesOligarchy Ditch
Location20 Ft W of CO RD 1
RouteCity Street 0
CountyBoulder County
StateColorado
Coordinates40.17106, -105.05572
Functional classUrban 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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
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 geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating78.6 US tons
Inventory rating47 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length25 ft (7.6 m)
Longest span12 ft (3.7 m)
Deck width63 ft (19.2 m)
Roadway width51 ft (15.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,709 (2023)
Projected traffic2,050 by 2043
Trucks5%
Lanes on structure3
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

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 Deerwood Drive over Oligarchy Ditch built?

It was built in 2000, making it 25 years old in 2025.

What condition is Deerwood Drive over Oligarchy 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 Deerwood Drive over Oligarchy Ditch carry?

About 1,709 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is Deerwood Drive over Oligarchy Ditch?

The structure is 25 ft (7.6 m) long with a longest span of 12 ft (3.7 m) and a deck 63 ft wide.

Who owns Deerwood Drive over Oligarchy Ditch?

It is owned by the City or Municipal Highway Agency.