SENTRY DRIVE
Carrying SENTRY DRIVE over CANADIAN NATIONAL RAILRO
0.3 MILES EAST OF GATE AT, Calhoun, Michigan
Data updated May 2026
FHWA NBI record, refreshed with each annual release.
Bridge Snapshot: SENTRY DRIVE
The SENTRY DRIVE bridge in Calhoun, Michigan carries SENTRY DRIVE over CANADIAN NATIONAL RAILRO. It was built in 2002, making it 24 years old today. The structure is built primarily of prestressed concrete and spans 3 sections, stretching 59.7 meters (196 feet) end to end. Daily traffic averages 150 vehicles, placing it in the lower-traffic tier of Michigan bridges. It is owned and maintained by Navy/Marine.
The latest FHWA inspection records show a deck rating of 6/9, superstructure at 6/9, substructure at 7/9. 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 47.2 metric tons.
Sourced from the FHWA National Bridge Inventory. See our methodology for refresh cadence and NBI release vintage.
How SENTRY DRIVE 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 How the historical reference is calculated.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
- 2002
- Material
- Prestressed Concrete
- Number of Spans
- 3
- Structure Length
- 59.7 m (196 ft)
- Deck Width
- 11.3 m (37 ft)
- Owner
- Navy/Marine
- Avg Daily Traffic
- 150 vehicles/day
- Structure Number
- AFMIMBMV07001
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗Condition Analysis
- • The deck (driving surface) is in fair condition (6/9), with minor deterioration that may require routine maintenance.
- • At 6/9, the superstructure (beams and supports above the deck) shows fair condition, with minor wear flagged for upkeep.
- • At 7/9, the substructure (piers and abutments) is in good shape and shows no significant wear.
How to read this record
This page shows what the last federal inspection recorded, not whether SENTRY DRIVE 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 SENTRY DRIVE against other structures in Calhoun 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 SENTRY DRIVE?
SENTRY DRIVE in Calhoun, Michigan has a deck rating of 6/9, superstructure rating of 6/9, and substructure rating of 7/9 on the FHWA's 0–9 scale.
How often is SENTRY DRIVE inspected?
SENTRY DRIVE'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 150 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. SENTRY DRIVE 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 SENTRY DRIVE?
SENTRY DRIVE has an NBI inventory load rating of 47.2 metric tons.
Who is responsible for maintaining SENTRY DRIVE?
SENTRY DRIVE is owned and maintained by Navy/Marine.
How old is SENTRY DRIVE and does age affect safety?
SENTRY DRIVE was built in 2002, making it 24 years old.
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.