Mountain River Rd
Carrying Mountain River Rd over Little Thompson River
50 ft S of W CR 4, Larimer, Colorado
Data updated May 2026
FHWA NBI record, refreshed with each annual release.
Bridge Snapshot: Mountain River Rd
The Mountain River Rd bridge in Larimer, Colorado carries Mountain River Rd over Little Thompson River. It was built in 1936, making it 90 years old today. It was last reconstructed in 2003, extending its service life. The structure is built primarily of steel and spans 1 section, stretching 31.5 meters (103 feet) end to end. Daily traffic averages 42 vehicles, placing it in the lower-traffic tier of Colorado bridges. It is owned and maintained by County Highway Agency.
The latest FHWA inspection records show a deck rating of 8/9, superstructure at 6/9, substructure at 8/9. The weakest component sits in fair condition. All reported major components score above the Poor range. Its NBI inventory load rating is 18.4 metric tons.
Sourced from the FHWA National Bridge Inventory. See our methodology for refresh cadence and NBI release vintage.
How Mountain River Rd compares
Live comparison across Colorado.
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 How the historical reference is calculated.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
- 1936
- Last Reconstructed
- 2003
- Material
- Steel
- Number of Spans
- 1
- Structure Length
- 31.5 m (103 ft)
- Deck Width
- 9.7 m (32 ft)
- Owner
- County Highway Agency
- Avg Daily Traffic
- 42 vehicles/day
- Structure Number
- LRMTNRIVERRD1
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗Condition Analysis
- • The deck (driving surface) rates good at 8/9, 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 (8/9), showing no significant deterioration.
How to read this record
This page shows what the last federal inspection recorded, not whether Mountain River 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 Mountain River Rd against other structures in Larimer and across Colorado. Colorado 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 Mountain River Rd?
Mountain River Rd in Larimer, Colorado has a deck rating of 8/9, superstructure rating of 6/9, and substructure rating of 8/9 on the FHWA's 0–9 scale.
How often is Mountain River Rd inspected?
Mountain River 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 42 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. Mountain River 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 Mountain River Rd?
Mountain River Rd has an NBI inventory load rating of 18.4 metric tons.
Who is responsible for maintaining Mountain River Rd?
Mountain River Rd is owned and maintained by County Highway Agency.
How old is Mountain River Rd and does age affect safety?
Mountain River Rd was built in 1936, making it 90 years old and last reconstructed in 2003.
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.