US Bridges

County Road S8 over Dolores River

Fair

San Miguel County, Colorado · 1.1 MI NW of Slick Rock · Structure no. SMGS8-0.4-8

Built
1957
68 years old
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
104 ft
1 main span
Daily traffic
10
2022 count
Owner
County
County Highway Agency

About this bridge

County Road S8 over Dolores River is a steel stringer/multi-beam or girder carrying County Road S8 over Dolores River in San Miguel County, Colorado. It was built in 1957, so it is 68 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 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 10 vehicles a day, projected to reach 11 by 2042. The structure is 104 ft (31.8 m) long and 16 ft wide. If it were closed, the detour would be 100 mi (161 km).

Location

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CarriesCounty Road S8
CrossesDolores River
Location1.1 MI NW of Slick Rock
RouteCounty Highway 0
CountySan Miguel County
StateColorado
Coordinates38.04408, -108.90597
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.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
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 evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating68.3 US tons
Inventory rating40.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length104 ft (31.8 m)
Longest span97 ft (29.7 m)
Deck width16 ft (5 m)
Roadway width15 ft (4.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10 (2022)
Projected traffic11 by 2042
Trucks0%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed100 mi (161 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was County Road S8 over Dolores River built?

It was built in 1957, making it 68 years old in 2025.

What condition is County Road S8 over Dolores 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 County Road S8 over Dolores River carry?

About 10 vehicles per day (2022 count).

How long is County Road S8 over Dolores River?

The structure is 104 ft (31.8 m) long with a longest span of 97 ft (29.7 m) and a deck 16 ft wide.

Who owns County Road S8 over Dolores River?

It is owned by the County Highway Agency.