MN 39
Carrying MN 39 over ST LOUIS RIVER
0.9 MI E OF JCT TH 23, St. Louis, Minnesota
Data updated May 2026
FHWA NBI record, refreshed with each annual release.
Bridge Snapshot: MN 39
The MN 39 bridge in St. Louis, Minnesota carries MN 39 over ST LOUIS RIVER. It was built in 1910, making it 116 years old today. It was last reconstructed in 1970, extending its service life. The structure is built primarily of steel and spans 2 sections, stretching 575.7 meters (1889 feet) end to end. Daily traffic averages 3,474 vehicles, placing it in the moderately-trafficked tier of Minnesota bridges. It is owned and maintained by Railroad.
The latest FHWA inspection records show a deck rating of 7/9, superstructure at 5/9, substructure at 5/9. The weakest component sits in fair condition. None of this bridge's reported major components fall into the Poor condition range. Its NBI inventory load rating is 32.7 metric tons.
Sourced from the FHWA National Bridge Inventory. See our methodology for refresh cadence and NBI release vintage.
How MN 39 compares
Live comparison across Minnesota.
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 How the historical reference is calculated.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
- 1910
- Last Reconstructed
- 1970
- Material
- Steel
- Number of Spans
- 2
- Structure Length
- 575.7 m (1889 ft)
- Deck Width
- 7.6 m (25 ft)
- Owner
- Railroad
- Avg Daily Traffic
- 3,474 vehicles/day
- Structure Number
- 6544
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗Condition Analysis
- • The deck (driving surface) rates good at 7/9, with no significant deterioration on file.
- • The superstructure (beams and supports above the deck) is in fair condition (5/9), with minor deterioration that may require routine maintenance.
- • 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 MN 39 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 MN 39 against other structures in St. Louis and across Minnesota. Minnesota 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 MN 39?
MN 39 in St. Louis, Minnesota has a deck rating of 7/9, superstructure rating of 5/9, and substructure rating of 5/9 on the FHWA's 0–9 scale.
How often is MN 39 inspected?
MN 39'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 3,474 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. MN 39 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 MN 39?
MN 39 has an NBI inventory load rating of 32.7 metric tons.
Who is responsible for maintaining MN 39?
MN 39 is owned and maintained by Railroad.
How old is MN 39 and does age affect safety?
MN 39 was built in 1910, making it 116 years old and last reconstructed in 1970.
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.