US Bridges

County Road 57P over San Miguel River

Fair

San Miguel County, Colorado · .1 MI S of SH 145 · Structure no. SMG57P-0.1-20A

Built
1987
38 years old
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
95 ft
1 main span
Daily traffic
243
2022 count
Owner
County
County Highway Agency

About this bridge

County Road 57P over San Miguel River is a prestressed concrete stringer/multi-beam or girder carrying County Road 57P over San Miguel River in San Miguel County, Colorado. It was built in 1987, so it is 38 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 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 243 vehicles a day, roughly 2% of them trucks, projected to reach 277 by 2042. The structure is 95 ft (28.9 m) long and 30 ft wide. If it were closed, the detour would be 14.9 mi (24 km).

Location

Open in Google Maps
CarriesCounty Road 57P
CrossesSan Miguel River
Location.1 MI S of SH 145
RouteCounty Highway 0
CountySan Miguel County
StateColorado
Coordinates37.99291, -108.02311
Functional classRural Minor 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating92.3 US tons
Inventory rating46.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length95 ft (28.9 m)
Longest span89 ft (27.2 m)
Deck width30 ft (9.1 m)
Roadway width28 ft (8.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic243 (2022)
Projected traffic277 by 2042
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.9 mi (24 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 57P over San Miguel River built?

It was built in 1987, making it 38 years old in 2025.

What condition is County Road 57P over San Miguel 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 57P over San Miguel River carry?

About 243 vehicles per day (2022 count), of which roughly 2% are trucks.

How long is County Road 57P over San Miguel River?

The structure is 95 ft (28.9 m) long with a longest span of 89 ft (27.2 m) and a deck 30 ft wide.

Who owns County Road 57P over San Miguel River?

It is owned by the County Highway Agency.