US Bridges

45-1120 over NM-170

Fair

San Juan County, New Mexico · 16.8 MI N of US-64 · Structure no. 000000000009036

Built
1986
39 years old
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
120 ft
1 main span
Daily traffic
681
2023 count
Owner
County
County Highway Agency

About this bridge

45-1120 over NM-170 is a steel stringer/multi-beam or girder carrying 45-1120 over NM-170 in San Juan County, New Mexico. It was built in 1986, so it is 39 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 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 681 vehicles a day, projected to reach 926 by 2043. The structure is 120 ft (36.6 m) long and 46 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Carries45-1120
CrossesNM-170
Location16.8 MI N of US-64
RouteCounty Highway 45000
Coordinates36.96313, -108.19304
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.4 US tons
Inventory rating36 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length120 ft (36.6 m)
Longest span113 ft (34.4 m)
Deck width46 ft (14 m)
Roadway width43 ft (13 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic681 (2023)
Projected traffic926 by 2043
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 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 45-1120 over NM-170 built?

It was built in 1986, making it 39 years old in 2025.

What condition is 45-1120 over NM-170 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 45-1120 over NM-170 carry?

About 681 vehicles per day (2023 count).

How long is 45-1120 over NM-170?

The structure is 120 ft (36.6 m) long with a longest span of 113 ft (34.4 m) and a deck 46 ft wide.

Who owns 45-1120 over NM-170?

It is owned by the County Highway Agency.