Na Cnty Rd 305
Carrying Na Cnty Rd 305 over Unnamed Draw
Casper, Natrona, Wyoming
Inventory: FHWA NBI 2024 · last ETL August 2026
FHWA NBI record, refreshed with each annual release.
Na Cnty Rd 305 in Natrona, Wyoming sits above 41% of rated Wyoming bridges on inventory load rating (33 t), while its 2015 build year is earlier than 3% of Natrona's recorded-year cohort (135 bridges).
Na Cnty Rd 305 in Natrona, Wyoming is rated Good in the FHWA's 2024 National Bridge Inventory. Built in 2015, it carries 1 rated component on the inspecting agency's 0-9 scale, and its weakest reported component scores 7. The lowest applicable rating sets the federal condition category, so this Good 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 WY:MPP
POST-2000 · CONCRETE · MULTI-SPAN · CULVERT-LED · ARTERIAL-ADT · STANDARD-LOAD · CAT-GOOD
- POST-2000 2000+
- CONCRETE Concrete
- MULTI-SPAN 2 spans
- CULVERT-LED Culvert-led
- ARTERIAL-ADT Arterial ADT
- STANDARD-LOAD Standard load
- CAT-GOOD Good
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: Na Cnty Rd 305
The Na Cnty Rd 305 bridge in Natrona, Wyoming carries Na Cnty Rd 305 over Unnamed Draw. It was built in 2015, making it 11 years old today. The structure is built primarily of concrete and spans 2 sections, stretching 7.0 meters (23 feet) end to end. Daily traffic averages 5,027 vehicles, placing it in the moderately-trafficked tier of Wyoming bridges. It is owned and maintained by City/Municipal Highway Agency.
The latest FHWA inspection records show culvert at 7/9. The weakest component sits in good condition. No reported major component scores in the Poor range under the current federal condition thresholds.
How Na Cnty Rd 305 compares
Age against the county: built in 2015, earlier than 4 of Natrona's 135 bridges with a recorded construction year (3%), against a county median build year of 1977. This is one of the newer structures in its county.
Live comparison across Wyoming bridges with a recorded inventory load rating (3,118 of 3,136 rated).
Na Cnty Rd 305 vs every rated Wyoming bridge
Inventory load rating (metric tons), FHWA NBI, this state
33 Top 59% higher than 41% of 3,118 bridges
rated Wyoming 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.
Natrona inventory by recorded NBI category
Exclusive Good/Fair/Poor bands across all 135 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
- 2015
- Material
- Concrete
- Number of Spans
- 2
- Structure Length
- 7.0 m (23 ft) 0
- Owner
- City/Municipal Highway Agency
- Avg Daily Traffic
- 5,027 vehicles/day
- Structure Number
- MPP
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 Na Cnty Rd 305 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 Na Cnty Rd 305 against other structures in Natrona and across Wyoming. Wyoming 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 Na Cnty Rd 305?
Na Cnty Rd 305 in Natrona, Wyoming on the FHWA's 0–9 scale.
How often is Na Cnty Rd 305 inspected?
Na Cnty Rd 305'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 5,027 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. Na Cnty Rd 305 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 Na Cnty Rd 305?
Na Cnty Rd 305 has an NBI inventory load rating of 32.7 metric tons.
Who is responsible for maintaining Na Cnty Rd 305?
Na Cnty Rd 305 is owned and maintained by City/Municipal Highway Agency.
How old is Na Cnty Rd 305 and does age affect safety?
Na Cnty Rd 305 was built in 2015, making it 11 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.