County profile · official public datasets

Massac County, IL

132 public highway bridges tracked in the FHWA National Bridge Inventory: 43.9% rated Good, 47.7% Fair, 8.3% Poor.

132
Public bridges: 43.9%
Good condition: 8.3%
Poor condition

The verdict

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

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

58th
of 102 on Poor share: 8.3%
Poor-condition share: 132
public highway bridges: 1980
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.

Massac County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Massac County ranks #58 of 102 Illinois counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 8.3%). Massac County, Illinois contains 132 public highway bridges. Roughly 43.9% are rated “Good,” 47.7% “Fair,” and 8.3% “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

132

Public highway bridges in Massac County

Good condition

43.9%

58 of 132 rated 7-9

Fair condition

47.7%

63 of 132 rated 5-6

Poor condition

8.3%

11 of 132 rated 4 or below

In-state Poor-share rank

#58 of 102

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

Condition distribution

Share of 132 NBI-tracked bridges by lowest applicable component rating.

Good

43.9% (58)

Fair

47.7% (63)

Poor

8.3% (11)

Massac County's Poor-condition bridges carry 12,700 vehicle crossings a day

That is 3.1% of the county's reported daily bridge traffic on 8.4% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 1,155 crossings a day against 3,707 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 131 of 132 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

34.8% of Massac County's bridges have passed the 50-year mark

46 of the 132 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 43.9% 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 83.5% of the county's Poor-condition bridge traffic

I 24 WB over BEAR CREEK, built 1971, carries 10,600 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 11-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 12,700 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

1900s

9
1920s

2
1930s

3
1950s

4
1960s

4
1970s

35
1980s

22
1990s

26
2000s

9
2010s

12
2020s

6

What this shows Construction peaked in the 1970s, when 35 of the county's bridges still in the inventory were built, which is 26.5% of those with a recorded year. That cohort is now 45 to 54 years old in the 2024 inventory. Its average build year (1980) matches the Illinois average (1979).

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

The 5 Illinois counties nearest Massac County in number of bridges, with their condition splits. Its 8.3% Poor share is the 4th-lowest of these 6. Its average build year of 1980 against a peer-group mean of 1984 is in line with the group.

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

Bridge inventory size and condition shares for Massac County and the 5 Illinois counties closest to it in inventory size
County	Bridges	Good	Fair	Poor	Avg. built
Henderson County	142	33.1%	54.9%	12%	1985
Perry County	136	38.2%	54.4%	7.4%	1981
Kendall County	132	52.3%	35.6%	12.1%	1990
Monroe County	132	59.1%	34.1%	6.8%	1986
Massac County (this page)	132	43.9%	47.7%	8.3%	1980
Johnson County	118	58.5%	39%	2.5%	1979

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

Similar inventory size

Nearest county inventories outside IL (132 bridges here).

St. Joseph County, MI · 132 bridges
Otero County, NM · 132 bridges
Prince George County, VA · 132 bridges
Suffolk city County, VA · 132 bridges

Similar average build year

Nearest mean year-built outside IL (1980 here).

Tulsa County, OK · avg 1980 · 1,135 bridges
Miami-Dade County, FL · avg 1980 · 1,057 bridges
Pulaski County, AR · avg 1980 · 721 bridges
McLennan County, TX · avg 1980 · 714 bridges

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

All 132 Good 58 Fair 63 Poor 11

All bridges (132)

Sort:

Massac County Bridge Snapshot

Condition distribution

Massac County's Poor-condition bridges carry 12,700 vehicle crossings a day

34.8% of Massac County's bridges have passed the 50-year mark

One structure carries 83.5% of the county's Poor-condition bridge traffic

How Massac 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

All bridges (132)

DEER RUN ROAD

MASSAC CREEK ROAD

INTERSTATE 24

TR 6-ANDERSON PIT

TR 23

TR 139

POWERS CHURCH ROAD

ILL 145

MARION ROAD

TR 126

US 45

TR 67

I 24 WB

I 24 EB

TR 95-FRITZ KORTE

FAS 959 ROSEBUD RD

UNIONVILLE ROAD

TR 45 BENTON RD

I 24 WB

I 24 EB

TR78A-HARRY WEBER

I 24 WB

I 24 EB

COUNTRY CLUB ROAD

TR 114 MIDWAY RD

TR 9 RICE HILL RD

ORCHARD ROAD

TWP RD 39

MIDWAY ROAD

FAS 959

TR 21

MASSAC CREEK RD

SUNSET LA

THOMPSON LANE

US 45

US 45

PELL RD

FAS 957 BIG BAY

FAS 956

TR 122

TR 4

MASSAC CREEK RD

TR-128

TR 25

FAS 2937-ILL 169

TR 65-KOMMER RD

TR 133-UNITY SCH R

TR 121

US 45-FAP 889

US 45

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