US Bridges

Indiana Avenue over Rock Creek

Fair

Boulder County, Colorado · 150 Ft N of Coalton D · Structure no. SUPER-INDIANA

Built
1999
26 years old
Condition
Fair
inspected February 2025
Type
Culvert
Concrete
Length
29 ft
2 main spans
Daily traffic
1,916
2023 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

Indiana Avenue over Rock Creek is a concrete culvert carrying Indiana Avenue over Rock Creek in Boulder County, Colorado. It was built in 1999, so it is 26 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 1,916 vehicles a day, roughly 2% of them trucks, projected to reach 2,299 by 2043. The structure is 29 ft (8.7 m) long and 154 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesIndiana Avenue
CrossesRock Creek
Location150 Ft N of Coalton D
RouteCity Street 0
Coordinates39.92978, -105.16
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 protection8 Very GoodNo problems noted.
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
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating110.1 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 20
Structure length29 ft (8.7 m)
Longest span14 ft (4.3 m)
Deck width154 ft (47 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,916 (2023)
Projected traffic2,299 by 2043
Trucks2%
Lanes on structure3
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

OwnerTown or Township Highway Agency
Maintained byTown or Township 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 Indiana Avenue over Rock Creek built?

It was built in 1999, making it 26 years old in 2025.

What condition is Indiana Avenue over Rock 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 Indiana Avenue over Rock Creek carry?

About 1,916 vehicles per day (2023 count), of which roughly 2% are trucks.

How long is Indiana Avenue over Rock Creek?

The structure is 29 ft (8.7 m) long with a longest span of 14 ft (4.3 m) and a deck 154 ft wide.

Who owns Indiana Avenue over Rock Creek?

It is owned by the Town or Township Highway Agency.