Total bridges
234
Public highway bridges in Morgan County
County profile · official public datasets
Morgan County, IL
234 public highway bridges tracked in the FHWA National Bridge Inventory: 48.7% rated Good, 42.7% Fair, 8.5% Poor.
- 234
- Public bridges
- 48.7%
- Good condition
- 8.5%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Morgan County pairs a higher-than-median Poor-condition share among rated counties in the state with a newer average build year than the state inventory.
- 62nd
- of 102 on Poor share
- 8.5%
- Poor-condition share
- 234
- public highway bridges
- 1984
- 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.
Morgan County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Morgan County ranks #62 of 102 Illinois counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 8.5%). Morgan County, Illinois contains 234 public highway bridges. Roughly 48.7% are rated “Good,” 42.7% “Fair,” and 8.5% “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.
Good condition
48.7%
114 of 234 rated 7-9
Fair condition
42.7%
100 of 234 rated 5-6
Poor condition
8.5%
20 of 234 rated 4 or below
In-state Poor-share rank
#62 of 102
Among Illinois counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 234 NBI-tracked bridges by lowest applicable component rating.
Good 48.7% (114)
Fair 42.7% (100)
Poor 8.5% (20)
Morgan County's Poor-condition bridges carry 22,250 vehicle crossings a day
That is 5.7% of the county's reported daily bridge traffic on 8.5% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 1,113 crossings a day against 1,393 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 234 of 234 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
20.9% of Morgan County's bridges have passed the 50-year mark
49 of the 234 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 48.7% 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 40.9% of the county's Poor-condition bridge traffic
IL 267/US 67/BL 67 over I-72/US 36, built 1975, carries 9,100 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 20-bridge count understates how much of the daily burden sits on a single crossing.
Share is of the 22,250 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When Morgan County's bridges were built
234 bridges with a recorded construction year, grouped by decade
- 1900s 6
1900–1909
6 bridges
- 1920s 3
1920–1929
3 bridges
- 1930s 4
1930–1939
4 bridges
- 1940s 4
1940–1949
4 bridges
- 1950s 9
1950–1959
9 bridges
- 1960s 17
1960–1969
17 bridges
- 1970s
1970–1979
41 bridges
- 1980s
1980–1989
44 bridges
- 1990s
1990–1999
48 bridges
- 2000s
2000–2009
43 bridges
- 2010s 13
2010–2019
13 bridges
- 2020s 2
2020–2029
2 bridges
What this shows Construction peaked in the 1990s, when 48 of the county's bridges still in the inventory were built, which is 20.5% of those with a recorded year. That cohort is now 25 to 34 years old in the 2024 inventory. Its average build year is 1984, 5 years newer than the Illinois average of 1979.
How Morgan County compares with Illinois's closest counties by inventory size
The 5 Illinois counties nearest Morgan County in number of bridges, with their condition splits. Its 8.5% Poor share is the 5th-lowest of these 6. Its average build year of 1984 against a peer-group mean of 1981 is in line with the group.
Showing the 5 closest of 101 Illinois counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Morgan County (this page) | 234 | 48.7% | 42.7% | 8.5% | 1984 |
| Washington County | 233 | 50.6% | 43.3% | 6% | 1973 |
| Douglas County | 232 | 76.3% | 22.4% | 1.3% | 1982 |
| Clark County | 230 | 62.6% | 32.6% | 4.8% | 1978 |
| Jackson County | 228 | 66.2% | 27.2% | 6.6% | 1987 |
| McHenry County | 227 | 41.4% | 38.3% | 20.3% | 1983 |
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 Morgan 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 Morgan County, both outside Illinois so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside IL (234 bridges here).
- Prince of Wales-Hyder County, AK · 234 bridges
- Lyon County, MN · 234 bridges
- Jackson County, NC · 234 bridges
- Eastland County, TX · 234 bridges
Similar average build year
Nearest mean year-built outside IL (1984 here).
- Hennepin County, MN · avg 1984 · 936 bridges
- Duval County, FL · avg 1984 · 831 bridges
- El Paso County, CO · avg 1984 · 686 bridges
- Bell County, TX · avg 1984 · 660 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
Poor-condition bridges (20)
CH 23
PoorOver: SPOON CRK.
5 MI W. WOODSON, Morgan, IL
Built 1963 Load: 0.0 t ADT: 50
TR 260
PoorOver: CONOVER CREEK
3.5 MI E LITERBERRY, Morgan, IL
Built 1955 Load: 0.0 t ADT: 25
TR 137
PoorOver: B&N RR
.5 M N JVILLE, Morgan, IL
Built 1900 Load: 0.0 t ADT: 50
TR 370
PoorOver: CREEK
0.5 MI E PRENTICE, Morgan, IL
Built 1900 Load: 4.2 t ADT: 50
TR 256
PoorOver: LITTLE INDIAN CREEK
2 MI. W. YATESVILLE, Morgan, IL
Built 1936 Load: 6.8 t ADT: 50
MS-6090 (CURTISS S
PoorOver: B&N RR
0.35MI N of IL 104, Morgan, IL
Built 1901 Load: 7.1 t ADT: 50
TR-179
PoorOver: Creek
3.5 MI E JACKSONVILL, Morgan, IL
Built 1970 Load: 19.8 t ADT: 50
EAST ST
PoorOver: TOWN BROOK
EAST ST AT CR, Morgan, IL
Built 1979 Load: 20.1 t ADT: 1,100
TR 256
PoorOver: INDIAN CR
2.5 MI SW YATESVILLE, Morgan, IL
Built 1967 Load: 20.4 t ADT: 50
TR 128
PoorOver: SPOON CREEK
2 MI W WOODSON, Morgan, IL
Built 1961 Load: 21.4 t ADT: 100
TR 230
PoorOver: CREEK
1.5 MI SW NORTONVILE, Morgan, IL
Built 1981 Load: 22.4 t ADT: 75
TR 214
PoorOver: MAUVAISE TERRE CREEK
2.5MISEJACKSONVILLE, Morgan, IL
Built 1969 Load: 23.3 t ADT: 300
FAU 8173 College A
PoorOver: MAUVAISE TERRE CR
.25 MI E JOHNSON, Morgan, IL
Built 1975 Load: 29.2 t ADT: 1,900
S MAIN ST
PoorOver: TOWN BROOK
S MAIN ST AT BROOK, Morgan, IL
Built 1985 Load: 29.2 t ADT: 8,000
FAS 1612
PoorOver: MAUVAISE TERRE CR
1MI N OF JACKSONVILL, Morgan, IL
Built 1976 Load: 30.1 t ADT: 700
TR 150
PoorOver: TRIB LITTLE INDIAN
1 MI N ARCARIA, Morgan, IL
Built 1982 Load: 30.8 t ADT: 75
CH 23
PoorOver: FAI 72
2.2 MI E SCOTT CO, Morgan, IL
Built 1976 Load: 31.1 t ADT: 100
TR 166
PoorOver: MAUVAISE TERRE CR
NE CL JACKSONVILLE, Morgan, IL
Built 1996 Load: 32.4 t ADT: 175
CH 2
PoorOver: MAUVAISE TERRE CR
E EDGE JACKSONVILLE, Morgan, IL
Built 1959 Load: 44.1 t ADT: 250
IL 267/US 67/BL 67
PoorOver: I-72/US 36
2.5M S IL104-JACKSVL, Morgan, IL
Built 1975 Load: 47.0 t ADT: 9,100
Read our methodology - how this data is sourced, computed, and verified.
Related
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.