BLACK ROCK RD
Carrying BLACK ROCK RD over GREAT SENECA CREEK
0.7 MI N OF JCT SR 28, Montgomery, Maryland
Data updated May 2026
FHWA NBI record, refreshed with each annual release.
Bridge Snapshot: BLACK ROCK RD
The BLACK ROCK RD bridge in Montgomery, Maryland carries BLACK ROCK RD over GREAT SENECA CREEK. It was built in 1965, making it 61 years old today. It was last reconstructed in 1993, extending its service life. The structure is built primarily of steel and spans 2 sections, stretching 22.6 meters (74 feet) end to end. Daily traffic averages 373 vehicles, placing it in the lower-traffic tier of Maryland bridges. It is owned and maintained by County Highway Agency.
The latest FHWA inspection records show a deck rating of 6/9, superstructure at 5/9, substructure at 5/9. The weakest component sits in fair condition. All reported major components score above the Poor range. Its NBI inventory load rating is 51.2 metric tons.
Sourced from the FHWA National Bridge Inventory. See our methodology for refresh cadence and NBI release vintage.
How BLACK ROCK RD compares
Live comparison across Maryland.
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 How the historical reference is calculated.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
- 1965
- Last Reconstructed
- 1993
- Material
- Steel
- Number of Spans
- 2
- Structure Length
- 22.6 m (74 ft)
- Deck Width
- 4.6 m (15 ft)
- Owner
- County Highway Agency
- Avg Daily Traffic
- 373 vehicles/day
- Structure Number
- 200000M-0047010
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.
- • At 5/9, the superstructure (beams and supports above the deck) shows fair condition, with minor wear flagged for upkeep.
- • The substructure (piers and abutments) rates fair at 5/9, minor deterioration that routine maintenance should address.
How to read this record
This page shows what the last federal inspection recorded, not whether BLACK ROCK 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 BLACK ROCK RD against other structures in Montgomery and across Maryland. Maryland 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 BLACK ROCK RD?
BLACK ROCK RD in Montgomery, Maryland has a deck rating of 6/9, superstructure rating of 5/9, and substructure rating of 5/9 on the FHWA's 0–9 scale.
How often is BLACK ROCK RD inspected?
BLACK ROCK 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 373 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. BLACK ROCK 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 BLACK ROCK RD?
BLACK ROCK RD has an NBI inventory load rating of 51.2 metric tons.
Who is responsible for maintaining BLACK ROCK RD?
BLACK ROCK RD is owned and maintained by County Highway Agency.
How old is BLACK ROCK RD and does age affect safety?
BLACK ROCK RD was built in 1965, making it 61 years old and last reconstructed in 1993.
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.