55th Ave.
Carrying 55th Ave. over BN RAILROAD
9 WEST OF NEW SALEM, Morton, North Dakota
Data updated May 2026
FHWA NBI record, refreshed with each annual release.
Bridge Snapshot: 55th Ave.
The 55th Ave. bridge in Morton, North Dakota carries 55th Ave. over BN RAILROAD. It was built in 1949, making it 77 years old today. It was last reconstructed in 1984, extending its service life. The structure is built primarily of wood or timber and spans 14 sections, stretching 68.6 meters (225 feet) end to end. Daily traffic averages 25 vehicles, placing it in the lower-traffic tier of North Dakota bridges. It is owned and maintained by Railroad.
The latest FHWA inspection records show a deck rating of 6/9, superstructure at 7/9, substructure at 5/9. The weakest component sits in fair condition. No reported major component scores in the Poor range under the current federal condition thresholds. Its NBI inventory load rating is 18.6 metric tons.
Sourced from the FHWA National Bridge Inventory. See our methodology for refresh cadence and NBI release vintage.
How 55th Ave. compares
Live comparison across North Dakota.
Historical Sufficiency Rating
PlainBridge-computedFHWA discontinued this calculated item; it does not determine current condition, funding eligibility, posting, or closure. How the historical reference is calculated.
Condition Ratings
Full 0–9 scale + sufficiency-rating breakdown: how condition ratings work.
Structural Details
- Year Built
- 1949
- Last Reconstructed
- 1984
- Material
- Wood or Timber
- Number of Spans
- 14
- Structure Length
- 68.6 m (225 ft)
- Deck Width
- 7.9 m (26 ft)
- Owner
- Railroad
- Avg Daily Traffic
- 25 vehicles/day
- Structure Number
- 000000030123100
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗Condition Analysis
- • At 6/9, the deck (driving surface) shows fair condition, with minor wear flagged for upkeep.
- • The superstructure (beams and supports above the deck) rates good at 7/9, with no significant deterioration on file.
- • At 5/9, the substructure (piers and abutments) shows fair condition, with minor wear flagged for upkeep.
How to read this record
This page shows what the last federal inspection recorded, not whether 55th Ave. is safe to cross today. Here is how to use it.
- NBI condition ratings reflect the latest record in this annual dataset, not a live status. Current routine inspection intervals are risk-based.
- Learn how the 0–9 condition scale and Good/Fair/Poor categories are defined. How condition ratings work
- Compare 55th Ave. against other structures in Morton and across North Dakota. North Dakota bridges
- Noticed visible damage or a safety concern? Report it to the agency that owns the bridge, or call 911 in an emergency. How to report a bridge
Condition codes come straight from the FHWA National Bridge Inventory and are not a real-time safety judgment. Only the owning agency, a state DOT, county, or other owner, can post, restrict, or close a bridge.
Frequently Asked Questions
What do the condition ratings mean for 55th Ave.?
55th Ave. in Morton, North Dakota has a deck rating of 6/9, superstructure rating of 7/9, and substructure rating of 5/9 on the FHWA's 0–9 scale.
How often is 55th Ave. inspected?
55th Ave.'s responsible agency sets its routine interval under FHWA's risk-based inspection rules; this page does not expose the scheduled interval. It carries about 25 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. 55th Ave. is currently shown as Fair condition from its component ratings; that category is not a live closure or safety decision.
What is the inventory load rating for 55th Ave.?
55th Ave. has an NBI inventory load rating of 18.6 metric tons.
Who is responsible for maintaining 55th Ave.?
55th Ave. is owned and maintained by Railroad.
How old is 55th Ave. and does age affect safety?
55th Ave. was built in 1949, making it 77 years old and last reconstructed in 1984.
Disclaimer: Bridge condition data is from the FHWA NBI and reflects the last reported inspection. A Poor condition rating is not a live declaration that a bridge is closed or unsafe for travel. For current closure, posting, or safety information, contact the responsible transportation agency.
Every figure on PlainBridge is rendered directly from federal source data, no number is typed in by an editor. This page draws directly on federal source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.