SD251
Carrying SD251 over MASDON CK
5.1 S JCT US 18, Gregory, South Dakota
Data updated May 2026
FHWA NBI record, refreshed with each annual release.
Bridge Snapshot: SD251
The SD251 bridge in Gregory, South Dakota carries SD251 over MASDON CK. It was built in 1996, making it 30 years old today. The structure is built primarily of concrete continuous and spans 2 sections, stretching 7.5 meters (25 feet) end to end. Daily traffic averages 405 vehicles, placing it in the lower-traffic tier of South Dakota bridges. It is owned and maintained by State Highway Agency.
The latest FHWA inspection records show culvert 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 79.0 metric tons.
Sourced from the FHWA National Bridge Inventory. See our methodology for refresh cadence and NBI release vintage.
How SD251 compares
Live comparison across South Dakota.
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 How the historical reference is calculated.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
- 1996
- Material
- Concrete Continuous
- Number of Spans
- 2
- Structure Length
- 7.5 m (25 ft)
- Owner
- State Highway Agency
- Avg Daily Traffic
- 405 vehicles/day
- Structure Number
- 000000027050241
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 SD251 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 SD251 against other structures in Gregory and across South Dakota. South Dakota 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 SD251?
SD251 in Gregory, South Dakota on the FHWA's 0–9 scale.
How often is SD251 inspected?
SD251'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 405 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. SD251 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 SD251?
SD251 has an NBI inventory load rating of 79.0 metric tons.
Who is responsible for maintaining SD251?
SD251 is owned and maintained by State Highway Agency.
How old is SD251 and does age affect safety?
SD251 was built in 1996, making it 30 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.