US Bridges

Mountain Dr. over Clover Basin Ditch

Good

Boulder County, Colorado · 200 Ft S. of Four Leaf DR · Structure no. LONG-MTNDR-NEL

Built
2018
7 years old
Condition
Good
inspected January 2025
Type
Culvert
Concrete
Length
40 ft
3 main spans
Daily traffic
1,399
2023 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

Mountain Dr. over Clover Basin Ditch is a concrete culvert carrying Mountain Dr. over Clover Basin Ditch in Boulder County, Colorado. It was built in 2018, so it is 7 years old, younger than the Colorado average of 42.2 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 1,399 vehicles a day, roughly 3% of them trucks, projected to reach 1,678 by 2042. The structure is 40 ft (12.2 m) long and 80 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesMountain Dr.
CrossesClover Basin Ditch
Location200 Ft S. of Four Leaf DR
RouteCity Street 0
CountyBoulder County
StateColorado
Coordinates40.1475, -105.17427
Functional classUrban Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection8 Very GoodNo problems noted.
Culvert7 GoodSome minor problems.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry8: Equal to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating39.2 US tons
Inventory rating32.2 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadHL 93
Structure length40 ft (12.2 m)
Longest span12 ft (3.7 m)
Deck width80 ft (24.4 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,399 (2023)
Projected traffic1,678 by 2042
Trucks3%
Lanes on structure2
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

OwnerTown or Township Highway Agency
Maintained byTown or Township 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 Mountain Dr. over Clover Basin Ditch built?

It was built in 2018, making it 7 years old in 2025.

What condition is Mountain Dr. over Clover Basin Ditch in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in January 2025.

How much traffic does Mountain Dr. over Clover Basin Ditch carry?

About 1,399 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Mountain Dr. over Clover Basin Ditch?

The structure is 40 ft (12.2 m) long with a longest span of 12 ft (3.7 m) and a deck 80 ft wide.

Who owns Mountain Dr. over Clover Basin Ditch?

It is owned by the Town or Township Highway Agency.