US Bridges

CR 4F/NAST Colony over Frying Pan River

FairPosted for load

Pitkin County, Colorado · .3 MI S of CR 105/MP 31.8 · Structure no. PIT-04F-1.0

Built
1958
67 years old, rebuilt 1984
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
65 ft
2 main spans
Daily traffic
3
2022 count
Owner
County
County Highway Agency

About this bridge

CR 4F/NAST Colony over Frying Pan River is a wood or timber stringer/multi-beam or girder carrying CR 4F/NAST Colony over Frying Pan River in Pitkin County, Colorado. It was built in 1958 and reconstructed in 1984, so it is 67 years old, older 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. Its operating status is: posted for load restriction.

It carries about 3 vehicles a day, projected to reach 4 by 2042. The structure is 65 ft (19.9 m) long and 16 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

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CarriesCR 4F/NAST Colony
CrossesFrying Pan River
Location.3 MI S of CR 105/MP 31.8
RouteCounty Highway 0
CountyPitkin County
StateColorado
Coordinates39.29808, -106.60578
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating38.1 US tons
Inventory rating26.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans2
Design loadHS 20
Structure length65 ft (19.9 m)
Longest span30 ft (9.1 m)
Deck width16 ft (4.8 m)
Roadway width14 ft (4.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3 (2022)
Projected traffic4 by 2042
Trucks0%
Lanes on structure1
Traffic directionOne-lane bridge for two-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 CR 4F/NAST Colony over Frying Pan River built?

It was built in 1958, making it 67 years old in 2025. It was reconstructed in 1984.

What condition is CR 4F/NAST Colony over Frying Pan River 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 May 2024.

How much traffic does CR 4F/NAST Colony over Frying Pan River carry?

About 3 vehicles per day (2022 count).

How long is CR 4F/NAST Colony over Frying Pan River?

The structure is 65 ft (19.9 m) long with a longest span of 30 ft (9.1 m) and a deck 16 ft wide.

Who owns CR 4F/NAST Colony over Frying Pan River?

It is owned by the County Highway Agency.