US Bridges

US 36 Ml over Davidson Ditch

Good

Boulder County, Colorado · 2.2 MI SE of JCT SH 157 · Structure no. E-16-ZF

Built
2015
10 years old
Condition
Good
inspected July 2023
Type
Culvert
Concrete
Length
23 ft
1 main span
Daily traffic
77,000
2020 count
Owner
State
State Highway Agency

About this bridge

US 36 Ml over Davidson Ditch is a concrete culvert carrying US 36 Ml over Davidson Ditch in Boulder County, Colorado. It was built in 2015, so it is 10 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 77,000 vehicles a day, roughly 2% of them trucks, projected to reach 89,320 by 2040. The structure is 23 ft (7.1 m) long and 195 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesUS 36 Ml
CrossesDavidson Ditch
Location2.2 MI SE of JCT SH 157
RouteU.S. Route 36B
Coordinates39.97068, -105.19934
Functional classRural Principal Arterial - Other

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 inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations on dry land well above flood water elevations
Structural evaluation7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating52.2 US tons
Inventory rating40.3 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans1
Design loadHL 93
Structure length23 ft (7.1 m)
Longest span23 ft (7.1 m)
Deck width195 ft (59.3 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic77,000 (2020)
Projected traffic89,320 by 2040
Trucks2%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 US 36 Ml over Davidson Ditch built?

It was built in 2015, making it 10 years old in 2025.

What condition is US 36 Ml over Davidson 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 July 2023.

How much traffic does US 36 Ml over Davidson Ditch carry?

About 77,000 vehicles per day (2020 count), of which roughly 2% are trucks.

How long is US 36 Ml over Davidson Ditch?

The structure is 23 ft (7.1 m) long with a longest span of 23 ft (7.1 m) and a deck 195 ft wide.

Who owns US 36 Ml over Davidson Ditch?

It is owned by the State Highway Agency.