SH 170 ML
Carrying SH 170 ML over COMMUNITY DITCH
E ENT ELDORADO STATE PARK, Boulder, Colorado
Data updated May 2026
FHWA NBI record, refreshed with each annual release.
Bridge Snapshot: SH 170 ML
The SH 170 ML bridge in Boulder, Colorado carries SH 170 ML over COMMUNITY DITCH. It was built in 1999, making it 27 years old today. The structure is built primarily of steel and spans 1 section, stretching 13.1 meters (43 feet) end to end. Daily traffic averages 1,300 vehicles, placing it in the moderately-trafficked tier of Colorado bridges. It is owned and maintained by State Park/Forest/Reservation.
The latest FHWA inspection records show a deck rating of 6/9, superstructure at 7/9, substructure at 7/9. The weakest component sits in fair condition. All reported major components score above the Poor range. Its NBI inventory load rating is 22.7 metric tons.
Sourced from the FHWA National Bridge Inventory. See our methodology for refresh cadence and NBI release vintage.
How SH 170 ML 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 How the historical reference is calculated.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
- 1999
- Material
- Steel
- Number of Spans
- 1
- Structure Length
- 13.1 m (43 ft)
- Deck Width
- 7.5 m (25 ft)
- Owner
- State Park/Forest/Reservation
- Avg Daily Traffic
- 1,300 vehicles/day
- Structure Number
- E-15-AA
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗Condition Analysis
- • The deck (driving surface) is in fair condition (6/9), with minor deterioration that may require routine maintenance.
- • The superstructure (beams and supports above the deck) rates good at 7/9, with no significant deterioration on file.
- • The substructure (piers and abutments) rates good at 7/9, with no significant deterioration on file.
How to read this record
This page shows what the last federal inspection recorded, not whether SH 170 ML 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 SH 170 ML against other structures in Boulder 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 SH 170 ML?
SH 170 ML in Boulder, Colorado has a deck rating of 6/9, superstructure rating of 7/9, and substructure rating of 7/9 on the FHWA's 0–9 scale.
How often is SH 170 ML inspected?
SH 170 ML'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 1,300 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. SH 170 ML 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 SH 170 ML?
SH 170 ML has an NBI inventory load rating of 22.7 metric tons.
Who is responsible for maintaining SH 170 ML?
SH 170 ML is owned and maintained by State Park/Forest/Reservation.
How old is SH 170 ML and does age affect safety?
SH 170 ML was built in 1999, making it 27 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.