US Bridges

Ebnd US 36 Ml over US 36 Spur/Baseline RD

Fair

Boulder County, Colorado · In Boulder · Structure no. D-15-AZ

Built
1963
62 years old, rebuilt 1977
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
179 ft
1 main span
Daily traffic
16,500
2020 count
Owner
State
State Highway Agency

About this bridge

Ebnd US 36 Ml over US 36 Spur/Baseline RD is a steel stringer/multi-beam or girder carrying Ebnd US 36 Ml over US 36 Spur/Baseline RD in Boulder County, Colorado. It was built in 1963 and reconstructed in 1977, so it is 62 years old, older 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 16,500 vehicles a day, roughly 3% of them trucks, projected to reach 18,150 by 2040. The structure is 179 ft (54.5 m) long and 52 ft wide.

CarriesEbnd US 36 Ml
CrossesUS 36 Spur/Baseline RD
LocationIn Boulder
RouteU.S. Route 36B
Coordinates40.00053, -105.25864
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating51.9 US tons
Inventory rating31.1 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+2 approach)
Design loadHS 20
Structure length179 ft (54.5 m)
Longest span96 ft (29.2 m)
Deck width52 ft (15.8 m)
Roadway width48 ft (14.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic16,500 (2020)
Projected traffic18,150 by 2040
Trucks3%
Lanes on structure2
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed—
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 Ebnd US 36 Ml over US 36 Spur/Baseline RD built?

It was built in 1963, making it 62 years old in 2025. It was reconstructed in 1977.

What condition is Ebnd US 36 Ml over US 36 Spur/Baseline RD 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 August 2023.

How much traffic does Ebnd US 36 Ml over US 36 Spur/Baseline RD carry?

About 16,500 vehicles per day (2020 count), of which roughly 3% are trucks.

How long is Ebnd US 36 Ml over US 36 Spur/Baseline RD?

The structure is 179 ft (54.5 m) long with a longest span of 96 ft (29.2 m) and a deck 52 ft wide.

Who owns Ebnd US 36 Ml over US 36 Spur/Baseline RD?

It is owned by the State Highway Agency.