County profile · official public datasets

Jo Daviess County, IL

193 public highway bridges tracked in the FHWA National Bridge Inventory: 46.1% rated Good, 44% Fair, 9.8% Poor.

193
Public bridges: 46.1%
Good condition: 9.8%
Poor condition

The verdict

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

Jo Daviess County pairs a higher-than-median Poor-condition share among rated counties in the state with an older average build year than the state inventory.

69th
of 102 on Poor share: 9.8%
Poor-condition share: 193
public highway bridges: 1973
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.

Jo Daviess County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Jo Daviess County ranks #69 of 102 Illinois counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 9.8%). Jo Daviess County, Illinois contains 193 public highway bridges. Roughly 46.1% are rated “Good,” 44% “Fair,” and 9.8% “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

193

Public highway bridges in Jo Daviess County

Good condition

46.1%

89 of 193 rated 7-9

Fair condition

44%

85 of 193 rated 5-6

Poor condition

9.8%

19 of 193 rated 4 or below

In-state Poor-share rank

#69 of 102

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

Condition distribution

Share of 193 NBI-tracked bridges by lowest applicable component rating.

Good

46.1% (89)

Fair

44% (85)

Poor

9.8% (19)

Jo Daviess County's Poor-condition bridges carry 8,525 vehicle crossings a day

That is 5% of the county's reported daily bridge traffic on 9.8% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 449 crossings a day against 413 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 193 of 193 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

43% of Jo Daviess County's bridges have passed the 50-year mark

83 of the 193 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 46.1% 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 44.6% of the county's Poor-condition bridge traffic

US 20 over RUSH CREEK, built 1971, carries 3,800 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 19-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 8,525 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

pre-1900

1
1900s

6
1910s

6
1920s

11
1930s

7
1940s

4
1950s

18
1960s

23
1970s

15
1980s

41
1990s

27
2000s

15
2010s

15
2020s

4

What this shows Construction peaked in the 1980s, when 41 of the county's bridges still in the inventory were built, which is 21.2% of those with a recorded year. That cohort is now 35 to 44 years old in the 2024 inventory. Its average build year is 1973, 6 years older than the Illinois average of 1979.

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

The 5 Illinois counties nearest Jo Daviess County in number of bridges, with their condition splits. Its 9.8% Poor share is the 6th-lowest of these 6. Its average build year of 1973 against a peer-group mean of 1981 is 8 years older.

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

Bridge inventory size and condition shares for Jo Daviess County and the 5 Illinois counties closest to it in inventory size
County	Bridges	Good	Fair	Poor	Avg. built
Warren County	199	69.3%	23.1%	7.5%	1985
Crawford County	197	33%	60.9%	6.1%	1983
Jo Daviess County (this page)	193	46.1%	44%	9.8%	1973
De Witt County	192	57.3%	37%	5.7%	1980
Union County	192	54.7%	41.7%	3.6%	1981
Clinton County	190	56.3%	36.3%	7.4%	1976

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 Jo Daviess 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 Jo Daviess County, both outside Illinois so the neighborhoods are not the same-state size table above.

Similar inventory size

Nearest county inventories outside IL (193 bridges here).

Cecil County, MD · 193 bridges
Blue Earth County, MN · 193 bridges
Jasper County, MS · 193 bridges
Cooper County, MO · 193 bridges

Similar average build year

Nearest mean year-built outside IL (1973 here).

Jefferson County, AL · avg 1973 · 1,068 bridges
Erie County, NY · avg 1973 · 906 bridges
Davidson County, TN · avg 1973 · 832 bridges
Lancaster County, PA · avg 1973 · 801 bridges

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

All 193 Good 89 Fair 85 Poor 19

Good-condition bridges (89)

Sort:

Jo Daviess County Bridge Snapshot

Condition distribution

Jo Daviess County's Poor-condition bridges carry 8,525 vehicle crossings a day

43% of Jo Daviess County's bridges have passed the 50-year mark

One structure carries 44.6% of the county's Poor-condition bridge traffic

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

Nationwide counties with similar inventory size or average build year

Similar inventory size

Similar average build year

Good-condition bridges (89)

TOWNSHIP ROAD NO 5

S ELIZ.SCALES MD R

TOWNSHIP RD NO 165

TOWNSHIP RD NO 197

S APPLE CANYONRO

TOWNSHIP RD NO 262

TOWNSHIP RD NO 127

IL 78

GREBNER RD (TR138-

S. GREBNER ROAD

E. CENTER RD (TR16

W. STAGECOACH TRAI

SOUTH CREEK RO

SOUTH EDEN ROAD

SO APPLE RIVER ROA

CHETLAIN LAIN

N KUPPERSMITH RD

MORLEY RD

MAMMOSER ROAD

TOWNSHIP ROAD 187

BUCKHILL ROAD

E RUSH CREEK RD

E TOWNSEND ROAD

TOWNSEND ROAD

SO GOODMILLER ROAD

124

GIDDS ROAD

SO TOWN HALL ROAD

TR 71A

SOUTH RIVER ROAD

W COUNCIL HILL ROA

MAHONEY ROAD

TR 17A

NO MILL CREEK RD

N. HOGDON RD

S GOOSE HOLLOW ROA

W. VALLEY RD (TR9)

TWP RD NO 187

N. VETA GRAND ROAD

SO. BURTON RD-TR10

S. BRUNNER RD-TR24

MILL CREEK RD./TR1

MILL CREEK RD./TR1

CRAZY HOLLOW RD

SCOUT CAMP RD(FAS7

STAGECOACH TRAIL-C

S. DERINDA ROAD

E. MASWBACH ROAD

E. HANOVER ROAD

TR 193-A

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