US Bridges

47-B28A over Tres Hermanos Creek

Fair

San Miguel County, New Mexico · 0.3 MI E of I-25 Frntg RD · Structure no. 000000000000997

Built
1930
95 years old
Condition
Fair
inspected February 2025
Type
Box Beam or Girders - Multiple
Concrete
Length
64 ft
2 main spans
Daily traffic
238
2023 count
Owner
County
County Highway Agency

About this bridge

47-B28A over Tres Hermanos Creek is a concrete box beam or girders - multiple carrying 47-B28A over Tres Hermanos Creek in San Miguel County, New Mexico. It was built in 1930, so it is 95 years old, older than the New Mexico average of 51.5 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 238 vehicles a day, roughly 11% of them trucks, projected to reach 323 by 2043. The structure is 64 ft (19.5 m) long and 24 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
Carries47-B28A
CrossesTres Hermanos Creek
Location0.3 MI E of I-25 Frntg RD
RouteCounty Highway 47028
CountySan Miguel County
StateNew Mexico
Coordinates35.39344, -105.31696
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.
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 inspectionFebruary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating44.6 US tons
Inventory rating26.8 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialConcrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length64 ft (19.5 m)
Longest span30 ft (9.1 m)
Deck width24 ft (7.4 m)
Roadway width23 ft (7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic238 (2023)
Projected traffic323 by 2043
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$92,000 (2030 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was 47-B28A over Tres Hermanos Creek built?

It was built in 1930, making it 95 years old in 2025.

What condition is 47-B28A over Tres Hermanos Creek 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 February 2025.

How much traffic does 47-B28A over Tres Hermanos Creek carry?

About 238 vehicles per day (2023 count), of which roughly 11% are trucks.

How long is 47-B28A over Tres Hermanos Creek?

The structure is 64 ft (19.5 m) long with a longest span of 30 ft (9.1 m) and a deck 24 ft wide.

Who owns 47-B28A over Tres Hermanos Creek?

It is owned by the County Highway Agency.