US Bridges

47th Street over South Goose Creek

Fair

Boulder County, Colorado · 40 Ft N of Pearl Parkway · Structure no. BOLD-19-0.01-01

Built
1986
39 years old
Condition
Fair
inspected February 2025
Type
Culvert
Concrete
Length
43 ft
4 main spans
Daily traffic
4,774
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

47th Street over South Goose Creek is a concrete culvert carrying 47th Street over South Goose Creek in Boulder County, Colorado. It was built in 1986, so it is 39 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 4,774 vehicles a day, roughly 9% of them trucks, projected to reach 5,729 by 2043. The structure is 43 ft (13.1 m) long and 53 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Carries47th Street
CrossesSouth Goose Creek
Location40 Ft N of Pearl Parkway
RouteCity Street 0
Coordinates40.02295, -105.24237
Functional classUrban Collector

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 protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable 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 spans4
Design loadHS 20
Structure length43 ft (13.1 m)
Longest span10 ft (2.9 m)
Deck width53 ft (16.2 m)
Roadway width51 ft (15.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,774 (2023)
Projected traffic5,729 by 2043
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was 47th Street over South Goose Creek built?

It was built in 1986, making it 39 years old in 2025.

What condition is 47th Street over South Goose Creek 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 47th Street over South Goose Creek carry?

About 4,774 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is 47th Street over South Goose Creek?

The structure is 43 ft (13.1 m) long with a longest span of 10 ft (2.9 m) and a deck 53 ft wide.

Who owns 47th Street over South Goose Creek?

It is owned by the City or Municipal Highway Agency.