SOUTH 8TH STREET
Carrying SOUTH 8TH STREET over CURTIS CREEK
QUINCY, Adams, Illinois
Inventory: FHWA NBI 2024 · last ETL August 2026
FHWA NBI record, refreshed with each annual release.
SOUTH 8TH STREET in Adams, Illinois sits above 10% of rated Illinois bridges on inventory load rating (24 t), while its 1899 build year is earlier than 99% of Adams's recorded-year cohort (319 bridges).
SOUTH 8TH STREET in Adams, Illinois is rated Good in the FHWA's 2024 National Bridge Inventory. Built in 1899, it carries 3 rated components 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 IL:001600100000000
PRE-1950 · MAT-OTHER · SINGLE-SPAN · TIED-CTRL · ARTERIAL-ADT · STANDARD-LOAD · CAT-GOOD
- PRE-1950 Pre-1950
- MAT-OTHER Other
- SINGLE-SPAN Single span
- TIED-CTRL Tied control
- 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: SOUTH 8TH STREET
The SOUTH 8TH STREET bridge in Adams, Illinois carries SOUTH 8TH STREET over CURTIS CREEK. It was built in 1899, making it 127 years old today. It was last reconstructed in 1995, extending its service life. The structure is built primarily of masonry and spans 1 section, stretching 26.5 meters (87 feet) end to end. Daily traffic averages 3,000 vehicles, placing it in the moderately-trafficked tier of Illinois bridges. It is owned and maintained by City/Municipal Highway Agency.
The latest FHWA inspection records show a deck rating of 8/9, superstructure at 7/9, substructure at 7/9. The weakest component sits in good condition. All reported major components score above the Poor range.
How SOUTH 8TH STREET compares
Age against the county: built in 1899, earlier than 316 of Adams's 319 bridges with a recorded construction year (99%), against a county median build year of 1982. Age is not a defect on its own, but it is the population from which future Poor ratings are drawn.
Live comparison across Illinois bridges with a recorded inventory load rating (26,904 of 26,928 rated).
SOUTH 8TH STREET vs every rated Illinois bridge
Inventory load rating (metric tons), FHWA NBI, this state
24 Top 90% higher than 10% of 26,904 bridges
rated Illinois 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.
Adams inventory by recorded NBI category
Exclusive Good/Fair/Poor bands across all 319 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
- 1899
- Last Reconstructed
- 1995
- Material
- Masonry
- Number of Spans
- 1
- Structure Length
- 26.5 m (87 ft)
- Deck Width
- 7.8 m (26 ft)
- Owner
- City/Municipal Highway Agency
- Avg Daily Traffic
- 3,000 vehicles/day
- Structure Number
- 001600100000000
Condition Analysis
- • The deck (driving surface) rates good at 8/9, with no significant deterioration on file.
- • At 7/9, the superstructure (beams and supports above the deck) is in good shape and shows no significant wear.
- • 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 SOUTH 8TH STREET 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 SOUTH 8TH STREET against other structures in Adams and across Illinois. Illinois 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 SOUTH 8TH STREET?
SOUTH 8TH STREET in Adams, Illinois has a deck rating of 8/9, superstructure rating of 7/9, and substructure rating of 7/9 on the FHWA's 0–9 scale.
How often is SOUTH 8TH STREET inspected?
SOUTH 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 3,000 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. SOUTH 8TH STREET 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 SOUTH 8TH STREET?
SOUTH 8TH STREET has an NBI inventory load rating of 24.3 metric tons.
Who is responsible for maintaining SOUTH 8TH STREET?
SOUTH 8TH STREET is owned and maintained by City/Municipal Highway Agency.
How old is SOUTH 8TH STREET and does age affect safety?
SOUTH 8TH STREET was built in 1899, making it 127 years old and last reconstructed in 1995.
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.