US Bridges

Martin Drive over Bear Crk and Bike Path

Fair

Boulder County, Colorado · 300 Ft. E of 36th St. · Structure no. BOLD-22-0.44-01

Built
1995
30 years old
Condition
Fair
inspected February 2025
Type
Culvert
Concrete
Length
33 ft
2 main spans
Daily traffic
662
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Martin Drive over Bear Crk and Bike Path is a concrete culvert carrying Martin Drive over Bear Crk and Bike Path in Boulder County, Colorado. It was built in 1995, so it is 30 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 5 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 662 vehicles a day, roughly 6% of them trucks, projected to reach 795 by 2043. The structure is 33 ft (10 m) long and 49 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesMartin Drive
CrossesBear Crk and Bike Path
Location300 Ft. E of 36th St.
RouteCity Street 0
CountyBoulder County
StateColorado
Coordinates39.99161, -105.25006
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 protection8 Very GoodNo problems noted.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionFebruary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating40 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length33 ft (10 m)
Longest span24 ft (7.3 m)
Deck width49 ft (14.9 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic662 (2023)
Projected traffic795 by 2043
Trucks6%
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

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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Martin Drive over Bear Crk and Bike Path built?

It was built in 1995, making it 30 years old in 2025.

What condition is Martin Drive over Bear Crk and Bike Path 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 February 2025.

How much traffic does Martin Drive over Bear Crk and Bike Path carry?

About 662 vehicles per day (2023 count), of which roughly 6% are trucks.

How long is Martin Drive over Bear Crk and Bike Path?

The structure is 33 ft (10 m) long with a longest span of 24 ft (7.3 m) and a deck 49 ft wide.

Who owns Martin Drive over Bear Crk and Bike Path?

It is owned by the City or Municipal Highway Agency.