147 ST
Carrying 147 ST over SOUTH FORK WHETSTONE RV
3.0E & 1.5N MILBANK, Grant, South Dakota
Inventory: FHWA NBI 2024 · last ETL August 2026
FHWA NBI record, refreshed with each annual release.
147 ST in Grant, South Dakota sits above 61% of rated South Dakota bridges on inventory load rating (33 t), while its 2006 build year is earlier than 25% of Grant's recorded-year cohort (205 bridges).
147 ST in Grant, South Dakota is rated Fair in the FHWA's 2024 National Bridge Inventory. Built in 2006, 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 SD:000000026327050
POST-2000 · PRESTRESS · SINGLE-SPAN · SUPER-LED · TRACE-ADT · STANDARD-LOAD · CAT-FAIR
- POST-2000 2000+
- PRESTRESS Prestressed concrete
- SINGLE-SPAN Single span
- SUPER-LED Superstructure-led
- TRACE-ADT Trace 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: 147 ST
The 147 ST bridge in Grant, South Dakota carries 147 ST over SOUTH FORK WHETSTONE RV. It was built in 2006, making it 20 years old today. The structure is built primarily of prestressed concrete and spans 1 section, stretching 24.7 meters (81 feet) end to end. Daily traffic averages 45 vehicles, placing it in the lower-traffic tier of South Dakota bridges. It is owned and maintained by County 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 147 ST compares
Age against the county: built in 2006, earlier than 51 of Grant's 205 bridges with a recorded construction year (25%), against a county median build year of 1993. This is one of the newer structures in its county.
Live comparison across South Dakota bridges with a recorded inventory load rating (5,886 of 5,887 rated).
147 ST vs every rated South Dakota bridge
Inventory load rating (metric tons), FHWA NBI, this state
33 Top 39% higher than 61% of 5,886 bridges
rated South Dakota 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.
Grant inventory by recorded NBI category
Exclusive Good/Fair/Poor bands across all 205 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
- 2006
- Material
- Prestressed Concrete
- Number of Spans
- 1
- Structure Length
- 24.7 m (81 ft)
- Deck Width
- 9.8 m (32 ft)
- Owner
- County Highway Agency
- Avg Daily Traffic
- 45 vehicles/day
- Structure Number
- 000000026327050
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.
- • At 7/9, the substructure (piers and abutments) is in good shape and shows no significant wear.
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 147 ST 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 147 ST against other structures in Grant 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 147 ST?
147 ST in Grant, South Dakota 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 147 ST inspected?
147 ST'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 45 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. 147 ST 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 147 ST?
147 ST has an NBI inventory load rating of 32.7 metric tons.
Who is responsible for maintaining 147 ST?
147 ST is owned and maintained by County Highway Agency.
How old is 147 ST and does age affect safety?
147 ST was built in 2006, making it 20 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.
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.