US Bridges

County Road 15B over Conundrum Creek

Good

Pitkin County, Colorado · 0.5 MI SW of County RD 15 · Structure no. PIT-15B-00.5A

Built
1997
28 years old
Condition
Good
inspected May 2024
Type
Slab
Wood or Timber
Length
33 ft
1 main span
Daily traffic
97
2022 count
Owner
County
County Highway Agency

About this bridge

County Road 15B over Conundrum Creek is a wood or timber slab carrying County Road 15B over Conundrum Creek in Pitkin County, Colorado. It was built in 1997, so it is 28 years old, younger 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 97 vehicles a day, roughly 2% of them trucks, projected to reach 106 by 2042. The structure is 33 ft (10 m) long and 18 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

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CarriesCounty Road 15B
CrossesConundrum Creek
Location0.5 MI SW of County RD 15
RouteCounty Highway 0
CountyPitkin County
StateColorado
Coordinates39.1248, -106.84875
Functional classRural Minor Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure9 ExcellentNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating71.8 US tons
Inventory rating55.3 US tons

Structure

Structure typeSlab
MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadHS 20
Structure length33 ft (10 m)
Longest span31 ft (9.3 m)
Deck width18 ft (5.5 m)
Roadway width16 ft (4.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic97 (2022)
Projected traffic106 by 2042
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 County Road 15B over Conundrum Creek built?

It was built in 1997, making it 28 years old in 2025.

What condition is County Road 15B over Conundrum 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 May 2024.

How much traffic does County Road 15B over Conundrum Creek carry?

About 97 vehicles per day (2022 count), of which roughly 2% are trucks.

How long is County Road 15B over Conundrum Creek?

The structure is 33 ft (10 m) long with a longest span of 31 ft (9.3 m) and a deck 18 ft wide.

Who owns County Road 15B over Conundrum Creek?

It is owned by the County Highway Agency.