US Bridges

SH 93 Ml over Ped. Underpass

Fair

Boulder County, Colorado · Broadway and 16th St. · Structure no. D-15-BG

Built
2013
12 years old
Condition
Fair
inspected June 2023
Type
Frame
Concrete
Length
28 ft
1 main span
Daily traffic
27,000
2020 count
Owner
State
State Highway Agency

About this bridge

SH 93 Ml over Ped. Underpass is a concrete frame carrying SH 93 Ml over Ped. Underpass in Boulder County, Colorado. It was built in 2013, so it is 12 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 27,000 vehicles a day, roughly 4% of them trucks, projected to reach 29,160 by 2040. The structure is 28 ft (8.5 m) long and 89 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesSH 93 Ml
CrossesPed. Underpass
LocationBroadway and 16th St.
RouteState Highway 93A
CountyBoulder County
StateColorado
Coordinates40.00598, -105.27213
Functional classUrban Other Principal Arterial

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating53.6 US tons
Inventory rating39.2 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length28 ft (8.5 m)
Longest span24 ft (7.3 m)
Deck width89 ft (27.2 m)
Roadway width76 ft (23.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic27,000 (2020)
Projected traffic29,160 by 2040
Trucks4%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesPedestrian / bicycle
Detour if closed0.6 mi (1 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 93 Ml over Ped. Underpass built?

It was built in 2013, making it 12 years old in 2025.

What condition is SH 93 Ml over Ped. Underpass 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 June 2023.

How much traffic does SH 93 Ml over Ped. Underpass carry?

About 27,000 vehicles per day (2020 count), of which roughly 4% are trucks.

How long is SH 93 Ml over Ped. Underpass?

The structure is 28 ft (8.5 m) long with a longest span of 24 ft (7.3 m) and a deck 89 ft wide.

Who owns SH 93 Ml over Ped. Underpass?

It is owned by the State Highway Agency.