US Bridges

SH 119 Ml over Oligarchy Ditch

Fair

Boulder County, Colorado · In Longmont · Structure no. D-16-DZ

Built
2004
21 years old
Condition
Fair
inspected September 2023
Type
Culvert
Concrete
Length
21 ft
2 main spans
Daily traffic
24,000
2020 count
Owner
State
State Highway Agency

About this bridge

SH 119 Ml over Oligarchy Ditch is a concrete culvert carrying SH 119 Ml over Oligarchy Ditch in Boulder County, Colorado. It was built in 2004, so it is 21 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 24,000 vehicles a day, roughly 4% of them trucks, projected to reach 26,880 by 2040. The structure is 21 ft (6.4 m) long and 96 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesSH 119 Ml
CrossesOligarchy Ditch
LocationIn Longmont
RouteState Highway 119B
CountyBoulder County
StateColorado
Coordinates40.15878, -105.06749
Functional classUrban Principal Arterial - Other Freeway or Expressway

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 protection8 Very GoodNo problems noted.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating47.6 US tons
Inventory rating28.5 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 20 + Mod
Structure length21 ft (6.4 m)
Longest span10 ft (3 m)
Deck width96 ft (29.3 m)
Roadway width96 ft (29.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic24,000 (2020)
Projected traffic26,880 by 2040
Trucks4%
Lanes on structure12
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was SH 119 Ml over Oligarchy Ditch built?

It was built in 2004, making it 21 years old in 2025.

What condition is SH 119 Ml 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 September 2023.

How much traffic does SH 119 Ml over Oligarchy Ditch carry?

About 24,000 vehicles per day (2020 count), of which roughly 4% are trucks.

How long is SH 119 Ml over Oligarchy Ditch?

The structure is 21 ft (6.4 m) long with a longest span of 10 ft (3 m) and a deck 96 ft wide.

Who owns SH 119 Ml over Oligarchy Ditch?

It is owned by the State Highway Agency.