County profile · official public datasets

Henry County, IL

328 public highway bridges tracked in the FHWA National Bridge Inventory: 49.4% rated Good, 39.6% Fair, 11% Poor.

328
Public bridges
49.4%
Good condition
11%
Poor condition

The verdict

According to the Federal Highway Administration's 2024 National Bridge Inventory.

Henry County posts a higher-than-median Poor-condition share among rated counties in the state across mid-size county bridge inventory.

79th
of 102 on Poor share
11%
Poor-condition share
328
public highway bridges
1978
avg year built

Poor is an FHWA condition category from the lowest applicable component rating (4 or below), not a live crossing-safety or closure decision. Rankings cover counties with at least five public highway bridges.

Henry County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Henry County ranks #79 of 102 Illinois counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 11%). Henry County, Illinois contains 328 public highway bridges. Roughly 49.4% are rated “Good,” 39.6% “Fair,” and 11% “Poor.” Poor means the lowest applicable deck, superstructure, substructure, or culvert rating is 4 or below on the 0–9 NBI scale. It is a condition category, not a live safety or closure decision.

Responsible agencies inspect covered bridges on risk-based intervals under current NBIS rules and submit inventory data to FHWA annually. The list below shows every NBI-tracked bridge in the county. Use the “Sort by” controls to change the ordering, and click any row for its reported inspection date, traffic count, and condition fields.

Source: FHWA National Bridge Inventory. See methodology for full definitions.

Total bridges

328

Public highway bridges in Henry County

Good condition

49.4%

162 of 328 rated 7-9

Fair condition

39.6%

130 of 328 rated 5-6

Poor condition

11%

36 of 328 rated 4 or below

In-state Poor-share rank

#79 of 102

Among Illinois counties with 5+ bridges, lower share ranks better

Condition distribution

Share of 328 NBI-tracked bridges by lowest applicable component rating.

Good
49.4% (162)
Fair
39.6% (130)
Poor
11% (36)

Henry County's Poor-condition bridges carry 76,285 vehicle crossings a day

That is 10.8% of the county's reported daily bridge traffic on 11% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 2,119 crossings a day against 833 for a Good-condition one. A Poor rating is a condition category, not a closure or a live safety judgement; it means the lowest applicable component rating is 4 or below.

Computed over the 327 of 328 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

39.6% of Henry County's bridges have passed the 50-year mark

130 of the 328 bridges with a recorded construction year were built in 1974 or earlier. Age alone is not a defect: a well-maintained older bridge can rate Good, and 49.4% of this county's inventory does. Even so, this older cohort is the population from which future Poor ratings are drawn, which is why the age profile below matters alongside the condition split above.

Cutoff derives from the 2024 release year minus a 50-year design life. Source: FHWA National Bridge Inventory, 2024 release.

One structure carries 14.2% of the county's Poor-condition bridge traffic

FAI 80 SB over CLEVELAND RD/FAP595, built 1965, carries 10,800 vehicles a day, the most of any Poor-rated structure here. The county's Poor-condition exposure is concentrated rather than evenly spread, so the 36-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 76,285 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

When Henry County's bridges were built

328 bridges with a recorded construction year, grouped by decade

bridges

What this shows Construction peaked in the 1960s, when 82 of the county's bridges still in the inventory were built, which is 25% of those with a recorded year. That cohort is now 55 to 64 years old in the 2024 inventory. Its average build year (1978) matches the Illinois average (1979).

Source FHWA National Bridge Inventory (year built) As of 2024 NBI release

How Henry County compares with Illinois's closest counties by inventory size

The 5 Illinois counties nearest Henry County in number of bridges, with their condition splits. Its 11% Poor share is the 5th-lowest of these 6. Its average build year of 1978 against a peer-group mean of 1978 is in line with the group.

Showing the 5 closest of 101 Illinois counties eligible for comparison.

Bridge inventory size and condition shares for Henry County and the 5 Illinois counties closest to it in inventory size
County Bridges Poor
Kane County 336 6.3%
Shelby County 335 7.2%
Pike County 330 10%
Henry County (this page) 328 11%
Christian County 321 16.8%
Adams County 319 6%

Each share is of that county's own total tracked bridges; peers are the counties with 5 or more bridges whose inventory size is closest to Henry County's. Source: FHWA National Bridge Inventory, 2024 release.

Nationwide counties with similar inventory size or average build year

Two NBI-derived peer sets for Henry County, both outside Illinois so the neighborhoods are not the same-state size table above.

Similar inventory size

Nearest county inventories outside IL (328 bridges here).

Similar average build year

Nearest mean year-built outside IL (1978 here).

Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.

All 328 Good 162 Fair 130 Poor 36

Poor-condition bridges (36)

TR 93

Poor

Over: GREEN RIVER TRIB

2.0 MI NW GENESEO, Henry, IL

Built 1935 Load: 0.0 t ADT: 150

TR 297

Poor

Over: BR OF EDWARDS RIVER

6.0 MI SE CAMBRIDGE, Henry, IL

Built 1960 Load: 0.0 t ADT: 50

TR 406

Poor

Over: BR MUD CREEK

3.0 MI SW ANNAWAN, Henry, IL

Built 1961 Load: 0.0 t ADT: 50

TR-426 A

Poor

Over: W Fork Spoon River

1.0 MI E KEWANEE, Henry, IL

Built 1962 Load: 0.0 t ADT: 125

CH 19

Poor

Over: HILLERY CREEK

3 MI. S. CAMBRIDGE, Henry, IL

Built 1959 Load: 7.1 t ADT: 325

TR 270

Poor

Over: BR OF OAT CREEK

6.0 MI SW ATKINSON, Henry, IL

Built 1890 Load: 11.3 t ADT: 25

US 6

Poor

Over: TURNER CREEK

.39 MI W IL 84 (N), Henry, IL

Built 1938 Load: 16.8 t ADT: 4,550

CH 14

Poor

Over: SPRING CR. TRIB.

7 MI. S.W. ATKINSON, Henry, IL

Built 1914 Load: 16.8 t ADT: 200

TR 355

Poor

Over: MUD CREEK

1.5 MI NE ALPHA, Henry, IL

Built 1948 Load: 16.8 t ADT: 50

CH 19

Poor

Over: S. EDWARDS RIVER

6 MI. S.W. CAMBRIDGE, Henry, IL

Built 1958 Load: 17.2 t ADT: 325

TR 46

Poor

Over: CAMP CREEK

.75 MI N LYNN CENTER, Henry, IL

Built 1965 Load: 17.2 t ADT: 275

TR 442

Poor

Over: MUD CREEK

3.0 MI N KEWANEE, Henry, IL

Built 1920 Load: 17.5 t ADT: 75

TR 298

Poor

Over: EDWARDS RIVER

7.5 MI SE CAMBRIDGE, Henry, IL

Built 1964 Load: 18.8 t ADT: 25

MS-6300 (E 450th S

Poor

Over: Mud Creek

1 MI S. OF US 6, Henry, IL

Built 1994 Load: 19.1 t ADT: 50

BRAIR BLUFF RD

Poor

Over: TURNER CREEK

0.4 MI. N. OF US 6, Henry, IL

Built 1920 Load: 19.4 t ADT: 125

TR 163

Poor

Over: OAT CREEK

4.5 MI SW ATKINSON, Henry, IL

Built 1937 Load: 19.4 t ADT: 50

TR 194

Poor

Over: BR OF SPRING CREEK

3.5 MI NE CAMBRIDGE, Henry, IL

Built 1930 Load: 19.4 t ADT: 50

TR 285

Poor

Over: MUD CREEK TRIBUTARY

2.0 MI N KEWANEE, Henry, IL

Built 1958 Load: 19.4 t ADT: 225

TR 163

Poor

Over: BR OF OAT CREEK

5.0 MI SW ATKINSON, Henry, IL

Built 1928 Load: 20.4 t ADT: 50

CH 39

Poor

Over: S. EDWARDS RIVER

BISHOP HILL, Henry, IL

Built 1969 Load: 21.4 t ADT: 650

TR 34

Poor

Over: MOSQUITO CREEK

AT WARNER, Henry, IL

Built 1938 Load: 22.7 t ADT: 75

CH 17

Poor

Over: EDWARDS R. TRIB.

2 MI. E. OPHIEM, Henry, IL

Built 1949 Load: 22.7 t ADT: 275

TR 10

Poor

Over: CAMP CREEK

3.0 MI W LYNN CENTER, Henry, IL

Built 1963 Load: 24.3 t ADT: 10

FAI 80 SB

Poor

Over: CLEVELAND RD/FAP595

2.1 M N JCT US 6, Henry, IL

Built 1965 Load: 24.6 t ADT: 10,800

TR 362

Poor

Over: WALKER CR

10 MI E CAMBRIDGE, Henry, IL

Built 1955 Load: 26.6 t ADT: 25

TR 157A

Poor

Over: MOSQUITO CREEK

WARNER STATION, Henry, IL

Built 1961 Load: 28.2 t ADT: 375

FAI 80 EB

Poor

Over: MINERAL CREEK

2.9 MI E JCT I74, Henry, IL

Built 1961 Load: 31.1 t ADT: 10,300

FAI 80 WB

Poor

Over: MINERAL CREEK

2.9 MI E JCT I74, Henry, IL

Built 1961 Load: 31.1 t ADT: 10,300

FAI 80 NB

Poor

Over: FAI 74

3 MI SE COLONA, Henry, IL

Built 1961 Load: 31.8 t ADT: 10,750

TR-384

Poor

Over: Mud Creek

3.0 MI NE ATKINSON, Henry, IL

Built 1969 Load: 32.4 t ADT: 50

TR 257

Poor

Over: MUD CREEK

5.5 M NW KEWANEE, Henry, IL

Built 1982 Load: 32.4 t ADT: 25

CH 34

Poor

Over: KING CREEK

2.5 M SE OF ANNAWAN, Henry, IL

Built 1985 Load: 32.4 t ADT: 200

TR 236

Poor

Over: SPRING CREEK

6.0 MI SE GENESEO, Henry, IL

Built 1948 Load: 37.9 t ADT: 75

FAI 80 NB

Poor

Over: CLEVELAND RD/FAU5864

2.1 MI N JCT US 6, Henry, IL

Built 1965 Load: 57.3 t ADT: 10,800

FAI 74 NB

Poor

Over: CAMP CREEK

2 MI N JCT ILL 81, Henry, IL

Built 1968 Load: 66.7 t ADT: 7,400

FAI 74 SB

Poor

Over: CAMP CREEK

2 MI N JCT ILL 81, Henry, IL

Built 1968 Load: 67.1 t ADT: 7,400

Read our methodology - how this data is sourced, computed, and verified.

Related

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Data sourced from official public datasets. See our methodology for details. Retrieved and formatted by PlainBridges

Every figure on PlainBridges 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. NBI condition categories reflect the latest reported inventory record, not a live safety, closure, or travel decision.