8TH STREET
Carrying 8TH STREET over BOYER RIVER
000000000, Harrison, Iowa
Data updated May 2026
FHWA NBI record, refreshed with each annual release.
Bridge Snapshot: 8TH STREET
The 8TH STREET bridge in Harrison, Iowa carries 8TH STREET over BOYER RIVER. It was built in 1900, making it 126 years old today. It was last reconstructed in 1972, extending its service life. The structure is built primarily of steel and spans 1 section, stretching 44.5 meters (146 feet) end to end. Daily traffic averages 123 vehicles, placing it in the lower-traffic tier of Iowa bridges. It is owned and maintained by City/Municipal Highway Agency.
The latest FHWA inspection records show a deck rating of 0/9, superstructure at 0/9, substructure at 0/9. The weakest component sits in critical condition. At least one major component here scores 4 or below, which produces a Poor condition classification under FHWA's current reporting rules.
Sourced from the FHWA National Bridge Inventory. See our methodology for refresh cadence and NBI release vintage.
How 8TH STREET compares
Live comparison across Iowa.
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 How the historical reference is calculated.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
- 1900
- Last Reconstructed
- 1972
- Material
- Steel
- Number of Spans
- 1
- Structure Length
- 44.5 m (146 ft)
- Deck Width
- 5.1 m (17 ft)
- Owner
- City/Municipal Highway Agency
- Avg Daily Traffic
- 123 vehicles/day
- Structure Number
- 000000000178090
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗Condition Analysis
- • The deck (driving surface) rates critical at 0/9, severe deterioration that needs urgent attention.
- • At 0/9, the superstructure (beams and supports above the deck) is in critical shape, with severe wear requiring urgent action.
- • The substructure (piers and abutments) rates critical at 0/9, severe deterioration that needs urgent attention.
How to read this record
8TH STREET is in the federal Poor condition category. That is a component-based result, not a closure order.
- NBI condition ratings reflect the latest record in this annual dataset, not a live status. Current routine inspection intervals are risk-based.
- Understand what Poor condition does and does not mean before drawing conclusions. Poor condition explained
- Compare 8TH STREET against other structures in Harrison and across Iowa. Iowa 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 8TH STREET?
8TH STREET in Harrison, Iowa has a deck rating of 0/9, superstructure rating of 0/9, and substructure rating of 0/9 on the FHWA's 0–9 scale.
How often is 8TH STREET inspected?
8TH STREET'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 123 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. 8TH STREET is currently shown as Poor condition from its component ratings; that category is not a live closure or safety decision.
What is the inventory load rating for 8TH STREET?
An inventory load rating is not recorded for 8TH STREET.
Who is responsible for maintaining 8TH STREET?
8TH STREET is owned and maintained by City/Municipal Highway Agency.
How old is 8TH STREET and does age affect safety?
8TH STREET was built in 1900, making it 126 years old and last reconstructed in 1972.
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.