FOREST ROAD 3470
Carrying FOREST ROAD 3470 over SOUTH BRANCH PAINT RIVER
1.5 MI NW OF BEECHWOOD, Iron, Michigan
Data updated May 2026
FHWA NBI record, refreshed with each annual release.
Bridge Snapshot: FOREST ROAD 3470
The FOREST ROAD 3470 bridge in Iron, Michigan carries FOREST ROAD 3470 over SOUTH BRANCH PAINT RIVER. It was built in 1952, making it 74 years old today. It was last reconstructed in 1995, extending its service life. The structure is built primarily of steel and spans 1 section, stretching 15.2 meters (50 feet) end to end. Daily traffic averages 50 vehicles, placing it in the lower-traffic tier of Michigan bridges. It is owned and maintained by U.S. Forest Service.
The latest FHWA inspection records show a deck rating of 7/9, superstructure at 7/9, substructure at 7/9. The weakest component sits in good condition. All reported major components score above the Poor range. Its NBI inventory load rating is 15.9 metric tons.
Sourced from the FHWA National Bridge Inventory. See our methodology for refresh cadence and NBI release vintage.
How FOREST ROAD 3470 compares
Live comparison across Michigan.
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 How the historical reference is calculated.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
- 1952
- Last Reconstructed
- 1995
- Material
- Steel
- Number of Spans
- 1
- Structure Length
- 15.2 m (50 ft)
- Deck Width
- 5.1 m (17 ft)
- Owner
- U.S. Forest Service
- Avg Daily Traffic
- 50 vehicles/day
- Structure Number
- 090703000001010
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗Condition Analysis
- • At 7/9, the deck (driving surface) is in good shape and shows no significant wear.
- • The superstructure (beams and supports above the deck) is in good condition (7/9), showing no significant deterioration.
- • The substructure (piers and abutments) is in good condition (7/9), showing no significant deterioration.
How to read this record
This page shows what the last federal inspection recorded, not whether FOREST ROAD 3470 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 FOREST ROAD 3470 against other structures in Iron and across Michigan. Michigan 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 FOREST ROAD 3470?
FOREST ROAD 3470 in Iron, Michigan has a deck rating of 7/9, superstructure rating of 7/9, and substructure rating of 7/9 on the FHWA's 0–9 scale.
How often is FOREST ROAD 3470 inspected?
FOREST ROAD 3470'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 50 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. FOREST ROAD 3470 is currently shown as Good condition from its component ratings; that category is not a live closure or safety decision.
What is the inventory load rating for FOREST ROAD 3470?
FOREST ROAD 3470 has an NBI inventory load rating of 15.9 metric tons.
Who is responsible for maintaining FOREST ROAD 3470?
FOREST ROAD 3470 is owned and maintained by U.S. Forest Service.
How old is FOREST ROAD 3470 and does age affect safety?
FOREST ROAD 3470 was built in 1952, making it 74 years old and last reconstructed in 1995.
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.