US Bridges

West Keystone Rd. over Snake River

Fair

Summit County, Colorado · 0.3 MI S of Highway 9 · Structure no. 117000800.30007

Built
1972
53 years old
Condition
Fair
inspected September 2024
Type
Tee Beam
Prestressed Concrete
Length
73 ft
1 main span
Daily traffic
1,640
2020 count
Owner
County
County Highway Agency

About this bridge

West Keystone Rd. over Snake River is a prestressed concrete tee beam carrying West Keystone Rd. over Snake River in Summit County, Colorado. It was built in 1972, so it is 53 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.

It carries about 1,640 vehicles a day, roughly 4% of them trucks, projected to reach 2,001 by 2040. The structure is 73 ft (22.3 m) long and 40 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesWest Keystone Rd.
CrossesSnake River
Location0.3 MI S of Highway 9
RouteCounty Highway 0
CountySummit County
StateColorado
Coordinates39.60565, -105.97184
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
Deck8 Very GoodNo problems noted.
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 inspectionSeptember 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 geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating40 US tons
Inventory rating36 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length73 ft (22.3 m)
Longest span67 ft (20.4 m)
Deck width40 ft (12.3 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,640 (2020)
Projected traffic2,001 by 2040
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 West Keystone Rd. over Snake River built?

It was built in 1972, making it 53 years old in 2025.

What condition is West Keystone Rd. over Snake 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 September 2024.

How much traffic does West Keystone Rd. over Snake River carry?

About 1,640 vehicles per day (2020 count), of which roughly 4% are trucks.

How long is West Keystone Rd. over Snake River?

The structure is 73 ft (22.3 m) long with a longest span of 67 ft (20.4 m) and a deck 40 ft wide.

Who owns West Keystone Rd. over Snake River?

It is owned by the County Highway Agency.