US Bridges

30th Street over North Goose Creek

Fair

Boulder County, Colorado · At Mapleton & 30th ST · Structure no. BOLD-07-1.72-04

Built
1994
31 years old
Condition
Fair
inspected February 2025
Type
Frame
Concrete
Length
60 ft
2 main spans
Daily traffic
21,233
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

30th Street over North Goose Creek is a concrete frame carrying 30th Street over North Goose Creek in Boulder County, Colorado. It was built in 1994, so it is 31 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 21,233 vehicles a day, roughly 4% of them trucks, projected to reach 25,480 by 2043. The structure is 60 ft (18.2 m) long and 124 ft wide.

Carries30th Street
CrossesNorth Goose Creek
LocationAt Mapleton & 30th ST
RouteCity Street 0
Coordinates40.02544, -105.25354
Functional classUrban Minor 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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionFebruary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating58.9 US tons
Inventory rating35.4 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length60 ft (18.2 m)
Longest span28 ft (8.5 m)
Deck width124 ft (37.9 m)
Roadway width58 ft (17.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic21,233 (2023)
Projected traffic25,480 by 2043
Trucks4%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed—
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 30th Street over North Goose Creek built?

It was built in 1994, making it 31 years old in 2025.

What condition is 30th Street over North 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 30th Street over North Goose Creek carry?

About 21,233 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is 30th Street over North Goose Creek?

The structure is 60 ft (18.2 m) long with a longest span of 28 ft (8.5 m) and a deck 124 ft wide.

Who owns 30th Street over North Goose Creek?

It is owned by the City or Municipal Highway Agency.