US Bridges

45-4599 over Irrigation Ditch

Poor

San Juan County, New Mexico · 0.23 M N US64 & SJCR4599 · Structure no. 000000000008115

Built
1966
59 years old
Condition
Poor
inspected December 2022
Type
Stringer/Multi-beam or Girder
Steel
Length
21 ft
1 main span
Daily traffic
681
2023 count
Owner
County
County Highway Agency

About this bridge

45-4599 over Irrigation Ditch is a steel stringer/multi-beam or girder carrying 45-4599 over Irrigation Ditch in San Juan County, New Mexico. It was built in 1966, so it is 59 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 poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 681 vehicles a day, projected to reach 926 by 2043. The structure is 21 ft (6.4 m) long and 31 ft wide.

Location

Open in Google Maps
Carries45-4599
CrossesIrrigation Ditch
Location0.23 M N US64 & SJCR4599
RouteCounty Highway 45599
CountySan Juan County
StateNew Mexico
Coordinates36.72687, -107.82411
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2022
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating32.4 US tons
Inventory rating19.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckCorrugated steel
Main spans1
Design loadH 20
Structure length21 ft (6.4 m)
Longest span21 ft (6.4 m)
Deck width31 ft (9.4 m)
Roadway width31 ft (9.3 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
CrossesWaterway
Detour if closed—
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$300,000 (2030 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was 45-4599 over Irrigation Ditch built?

It was built in 1966, making it 59 years old in 2025.

What condition is 45-4599 over Irrigation Ditch in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in December 2022.

How much traffic does 45-4599 over Irrigation Ditch carry?

About 681 vehicles per day (2023 count).

How long is 45-4599 over Irrigation Ditch?

The structure is 21 ft (6.4 m) long with a longest span of 21 ft (6.4 m) and a deck 31 ft wide.

Who owns 45-4599 over Irrigation Ditch?

It is owned by the County Highway Agency.