US Bridges

Aurora Avenue over Gregory Creek

Good

Boulder County, Colorado · 15 Ft. W of 6th Street · Structure no. BOLD-35-AURORAA

Built
1980
45 years old
Condition
Good
inspected January 2025
Type
Culvert
Concrete
Length
21 ft
2 main spans
Daily traffic
226
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Aurora Avenue over Gregory Creek is a concrete culvert carrying Aurora Avenue over Gregory Creek in Boulder County, Colorado. It was built in 1980, so it is 45 years old, older 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 226 vehicles a day, roughly 5% of them trucks, projected to reach 271 by 2043. The structure is 21 ft (6.3 m) long and 48 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesAurora Avenue
CrossesGregory Creek
Location15 Ft. W of 6th Street
RouteCity Street 0
Coordinates40.00364, -105.28689
Functional classUrban Local

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 protection7 GoodSome minor problems.
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 geometry7: Better than 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
DeckNot applicable
Main spans2
Design loadUnknown
Structure length21 ft (6.3 m)
Longest span10 ft (3 m)
Deck width48 ft (14.6 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic226 (2023)
Projected traffic271 by 2043
Trucks5%
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 Aurora Avenue over Gregory Creek built?

It was built in 1980, making it 45 years old in 2025.

What condition is Aurora Avenue over Gregory Creek 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 Aurora Avenue over Gregory Creek carry?

About 226 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is Aurora Avenue over Gregory Creek?

The structure is 21 ft (6.3 m) long with a longest span of 10 ft (3 m) and a deck 48 ft wide.

Who owns Aurora Avenue over Gregory Creek?

It is owned by the City or Municipal Highway Agency.