US Bridges

Fdr 474 over Rio Chama

FairPosted for load

Rio Arriba County, New Mexico · 2.7 MI Nw/O Big Eddy Boat · Structure no. 031001000001001

Built
1989
36 years old
Condition
Fair
inspected June 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
71 ft
1 main span
Daily traffic
99
2022 count
Owner
Federal
U.S. Forest Service

About this bridge

Fdr 474 over Rio Chama is a prestressed concrete box beam or girders - multiple carrying Fdr 474 over Rio Chama in Rio Arriba County, New Mexico. It was built in 1989, so it is 36 years old, younger 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 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 99 vehicles a day, projected to reach 150 by 2042. The structure is 71 ft (21.6 m) long and 12 ft wide. If it were closed, the detour would be 98.2 mi (158 km).

Location

Open in Google Maps
CarriesFdr 474
CrossesRio Chama
Location2.7 MI Nw/O Big Eddy Boat
RouteFederal Lands Road 474
CountyRio Arriba County
StateNew Mexico
Coordinates36.32989, -106.62523
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating18.5 US tons
Inventory rating14.3 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length71 ft (21.6 m)
Longest span70 ft (21.3 m)
Deck width12 ft (3.7 m)
Roadway width11 ft (3.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic99 (2022)
Projected traffic150 by 2042
Trucks—
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.2 mi (158 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerU.S. Forest Service
Maintained byU.S. Forest Service
Historic statusHistorical significance not determinable at this time
Work proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$240,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Fdr 474 over Rio Chama built?

It was built in 1989, making it 36 years old in 2025.

What condition is Fdr 474 over Rio Chama 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 2023.

How much traffic does Fdr 474 over Rio Chama carry?

About 99 vehicles per day (2022 count).

How long is Fdr 474 over Rio Chama?

The structure is 71 ft (21.6 m) long with a longest span of 70 ft (21.3 m) and a deck 12 ft wide.

Who owns Fdr 474 over Rio Chama?

It is owned by the U.S. Forest Service.