US Bridges

CO RD 317 over Slate River

Fair

Gunnison County, Colorado · 0.5 MI N of Crested Butte · Structure no. GUN317-00.40A

Built
1983
42 years old
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
65 ft
1 main span
Daily traffic
5,823
2022 count
Owner
County
County Highway Agency

About this bridge

CO RD 317 over Slate River is a steel stringer/multi-beam or girder carrying CO RD 317 over Slate River in Gunnison County, Colorado. It was built in 1983, so it is 42 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 5,823 vehicles a day, roughly 5% of them trucks, projected to reach 6,754 by 2042. The structure is 65 ft (19.8 m) long and 28 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

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CarriesCO RD 317
CrossesSlate River
Location0.5 MI N of Crested Butte
RouteCounty Highway 0
CountyGunnison County
StateColorado
Coordinates38.87733, -106.97708
Functional classRural Major 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
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.
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 inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating44.3 US tons
Inventory rating26.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckCorrugated steel
Main spans1
Design loadHS 20
Structure length65 ft (19.8 m)
Longest span63 ft (19.1 m)
Deck width28 ft (8.5 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,823 (2022)
Projected traffic6,754 by 2042
Trucks5%
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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost$352,000 (2020 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was CO RD 317 over Slate River built?

It was built in 1983, making it 42 years old in 2025.

What condition is CO RD 317 over Slate 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 June 2024.

How much traffic does CO RD 317 over Slate River carry?

About 5,823 vehicles per day (2022 count), of which roughly 5% are trucks.

How long is CO RD 317 over Slate River?

The structure is 65 ft (19.8 m) long with a longest span of 63 ft (19.1 m) and a deck 28 ft wide.

Who owns CO RD 317 over Slate River?

It is owned by the County Highway Agency.