US Bridges

County Road 90A over San Miguel River

Fair

Montrose County, Colorado · Just NW of CR BB36/PINON · Structure no. 085090A07.0014A

Built
1984
41 years old
Condition
Fair
inspected September 2023
Type
Truss - Thru
Steel
Length
105 ft
1 main span
Daily traffic
50
2022 count
Owner
County
County Highway Agency

About this bridge

County Road 90A over San Miguel River is a steel truss - thru carrying County Road 90A over San Miguel River in Montrose County, Colorado. It was built in 1984, so it is 41 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 50 vehicles a day, projected to reach 59 by 2042. The structure is 105 ft (31.9 m) long and 24 ft wide. If it were closed, the detour would be 19.9 mi (32 km).

Location

Open in Google Maps
CarriesCounty Road 90A
CrossesSan Miguel River
LocationJust NW of CR BB36/PINON
RouteCounty Highway 0
CountyMontrose County
StateColorado
Coordinates38.26662, -108.40146
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
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 2023
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 alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating34.9 US tons
Inventory rating20.9 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckCorrugated steel
Main spans1
Design loadUnknown
Structure length105 ft (31.9 m)
Longest span96 ft (29.4 m)
Deck width24 ft (7.4 m)
Roadway width24 ft (7.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2022)
Projected traffic59 by 2042
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.9 mi (32 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 90A over San Miguel River built?

It was built in 1984, making it 41 years old in 2025.

What condition is County Road 90A 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 September 2023.

How much traffic does County Road 90A over San Miguel River carry?

About 50 vehicles per day (2022 count).

How long is County Road 90A over San Miguel River?

The structure is 105 ft (31.9 m) long with a longest span of 96 ft (29.4 m) and a deck 24 ft wide.

Who owns County Road 90A over San Miguel River?

It is owned by the County Highway Agency.