BASELINE RD
Carrying BASELINE RD over US-127
1.1 MI N OF US-127 BR, Isabella, Michigan
Inventory: FHWA NBI 2024 · last ETL August 2026
FHWA NBI record, refreshed with each annual release.
BASELINE RD in Isabella, Michigan sits above 16% of rated Michigan bridges on inventory load rating (29 t), while its 1965 build year is earlier than 70% of Isabella's recorded-year cohort (183 bridges).
BASELINE RD in Isabella, Michigan is rated Fair in the FHWA's 2024 National Bridge Inventory. Built in 1965, it carries 3 rated components on the inspecting agency's 0-9 scale, and its weakest reported component scores 6. The lowest applicable rating sets the federal condition category, so this Fair result describes the weakest reported component rather than the structure as a whole. No NBI category is a closure decision or a live crossing-safety verdict.
NBI record plate
Structure MI:000000000004255
INTERSTATE-ERA · PRESTRESS · LONG-SPAN-RUN · SUPER-LED · LOCAL-ADT · STANDARD-LOAD · CAT-FAIR
- INTERSTATE-ERA 1950–1979
- PRESTRESS Prestressed concrete
- LONG-SPAN-RUN 4 spans
- SUPER-LED Superstructure-led
- LOCAL-ADT Local ADT
- STANDARD-LOAD Standard load
- CAT-FAIR Fair
Inspection-sheet codes from this record’s year, material family, spans, controlling component, ADT, inventory load, and NBI category, not a live closure verdict.
Bridge Snapshot: BASELINE RD
The BASELINE RD bridge in Isabella, Michigan carries BASELINE RD over US-127. It was built in 1965, making it 61 years old today. It was last reconstructed in 2015, extending its service life. The structure is built primarily of prestressed concrete and spans 4 sections, stretching 63.9 meters (210 feet) end to end. Daily traffic averages 230 vehicles, placing it in the lower-traffic tier of Michigan bridges. It is owned and maintained by State Highway Agency.
The latest FHWA inspection records show a deck rating of 7/9, 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.
How BASELINE RD compares
Age against the county: built in 1965, earlier than 128 of Isabella's 183 bridges with a recorded construction year (70%), against a county median build year of 1980. Age is not a defect on its own, but it is the population from which future Poor ratings are drawn.
Live comparison across Michigan bridges with a recorded inventory load rating (11,366 of 11,371 rated).
BASELINE RD vs every rated Michigan bridge
Inventory load rating (metric tons), FHWA NBI, this state
29 Top 84% higher than 16% of 11,366 bridges
rated Michigan bridges, bucketed by value
Each bar is a band; taller bars hold more bridges. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.
Source FHWA National Bridge Inventory · August 2026
Condition Ratings
Full 0–9 scale + sufficiency-rating breakdown: how condition ratings work.
Reported 0–9 component ratings from the FHWA NBI. The highlighted component is the lowest reported input to this record’s current condition category; it is not a closure or live crossing-safety decision.
Isabella inventory by recorded NBI category
Exclusive Good/Fair/Poor bands across all 183 bridges in this county. Orthogonal to this structure's component profile above: a county catalog share, not a live crossing-safety verdict.
Structural Details
- Year Built
- 1965
- Last Reconstructed
- 2015
- Material
- Prestressed Concrete
- Number of Spans
- 4
- Structure Length
- 63.9 m (210 ft)
- Deck Width
- 9.6 m (31 ft)
- Owner
- State Highway Agency
- Avg Daily Traffic
- 230 vehicles/day
- Structure Number
- 000000000004255
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) rates fair at 6/9, minor deterioration that routine maintenance should address.
- • The substructure (piers and abutments) is in good condition (7/9), showing no significant deterioration.
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗How to read this record
This page shows what the last federal inspection recorded, not whether BASELINE RD 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 BASELINE RD against other structures in Isabella 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 BASELINE RD?
BASELINE RD in Isabella, Michigan has a deck rating of 7/9, superstructure rating of 6/9, and substructure rating of 7/9 on the FHWA's 0–9 scale.
How often is BASELINE RD inspected?
BASELINE RD'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 230 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. BASELINE RD 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 BASELINE RD?
BASELINE RD has an NBI inventory load rating of 29.2 metric tons.
Who is responsible for maintaining BASELINE RD?
BASELINE RD is owned and maintained by State Highway Agency.
How old is BASELINE RD and does age affect safety?
BASELINE RD was built in 1965, making it 61 years old and last reconstructed in 2015.
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.
Share this inspection record
Send this source-bounded record or download its data card. An NBI condition category is not a closure or live crossing-safety verdict.
Every figure on PlainBridges is rendered directly from federal source data, no number is typed in by an editor. Component ratings, ADT, and condition category on this page are copied from the NBI record for this structure; no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 2024 NBI release. NBI condition categories reflect the latest reported inventory record, not a live safety, closure, or travel decision.