Total bridges
382
Public highway bridges in Jasper County
County profile · official public datasets
Jasper County, IA
382 public highway bridges tracked in the FHWA National Bridge Inventory: 38.5% rated Good, 32.5% Fair, 29.1% Poor.
- 382
- Public bridges
- 38.5%
- Good condition
- 29.1%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Jasper County posts a higher-than-median Poor-condition share among rated counties in the state across mid-size county bridge inventory.
- 77th
- of 99 on Poor share
- 29.1%
- Poor-condition share
- 382
- public highway bridges
- 1977
- 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.
Jasper County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Jasper County ranks #77 of 99 Iowa counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 29.1%). Jasper County, Iowa contains 382 public highway bridges. Roughly 38.5% are rated “Good,” 32.5% “Fair,” and 29.1% “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
38.5%
147 of 382 rated 7-9
Fair condition
32.5%
124 of 382 rated 5-6
Poor condition
29.1%
111 of 382 rated 4 or below
In-state Poor-share rank
#77 of 99
Among Iowa counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 382 NBI-tracked bridges by lowest applicable component rating.
Good 38.5% (147)
Fair 32.5% (124)
Poor 29.1% (111)
Jasper County's Poor-condition bridges carry 16,570 vehicle crossings a day
That is 2.3% of the county's reported daily bridge traffic on 28.9% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 151 crossings a day against 968 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 381 of 382 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
45.8% of Jasper County's bridges have passed the 50-year mark
175 of the 382 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 38.5% 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 9.2% of the county's Poor-condition bridge traffic
HIGHWAY F-48 W over SMALL STREAM, built 1949, carries 1,530 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 111-bridge count understates how much of the daily burden sits on a single crossing.
Share is of the 16,570 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When Jasper County's bridges were built
382 bridges with a recorded construction year, grouped by decade
- 1910s 12
1910–1919
12 bridges
- 1920s
1920–1929
26 bridges
- 1930s 22
1930–1939
22 bridges
- 1940s 19
1940–1949
19 bridges
- 1950s
1950–1959
27 bridges
- 1960s
1960–1969
50 bridges
- 1970s
1970–1979
39 bridges
- 1980s
1980–1989
28 bridges
- 1990s
1990–1999
45 bridges
- 2000s
2000–2009
37 bridges
- 2010s
2010–2019
57 bridges
- 2020s 20
2020–2029
20 bridges
What this shows Construction peaked in the 2010s, when 57 of the county's bridges still in the inventory were built, which is 14.9% of those with a recorded year. That cohort is now 5 to 14 years old in the 2024 inventory. Its average build year (1977) matches the Iowa average (1979).
How Jasper County compares with Iowa's closest counties by inventory size
The 5 Iowa counties nearest Jasper County in number of bridges, with their condition splits. Its 29.1% Poor share is the 6th-lowest of these 6. Its average build year of 1977 against a peer-group mean of 1982 is 5 years older.
Showing the 5 closest of 98 Iowa counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Jasper County (this page) | 382 | 38.5% | 32.5% | 29.1% | 1977 |
| Benton County | 374 | 34.2% | 42.8% | 23% | 1984 |
| Clinton County | 372 | 66.7% | 30.4% | 3% | 1986 |
| Johnson County | 372 | 39.5% | 50.3% | 10.2% | 1979 |
| Fayette County | 362 | 35.1% | 40.3% | 24.6% | 1974 |
| Dubuque County | 346 | 50.6% | 40.8% | 8.7% | 1989 |
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 Jasper 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 Jasper County, both outside Iowa so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside IA (382 bridges here).
- Orleans County, LA · 382 bridges
- Stephens County, OK · 382 bridges
- Trumbull County, OH · 383 bridges
- Webb County, TX · 383 bridges
Similar average build year
Nearest mean year-built outside IA (1977 here).
- San Diego County, CA · avg 1977 · 1,632 bridges
- King County, WA · avg 1977 · 1,238 bridges
- Riverside County, CA · avg 1977 · 1,117 bridges
- Shelby County, TN · avg 1977 · 1,077 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
Fair-condition bridges (124)
S 124TH AVE E
FairOver: ELK CREEK
078183605, Jasper, IA
Built 1987 Load: 37.6 t ADT: 45
IA 14
FairOver: WARREN GROVE CREEK
1.9 MI. N OF N JCT SR F62, Jasper, IA
Built 1971 Load: 37.7 t ADT: 3,730
US 6
FairOver: ROCK CREEK
3.3 MI. E OF JCT. IA 224, Jasper, IA
Built 1980 Load: 37.9 t ADT: 2,140
S 28TH AVE E
FairOver: ELK CREEK
079180707, Jasper, IA
Built 2000 Load: 38.1 t ADT: 710
EB I-80
FairOver: WEST 148TH ST SOUTH
1.0 MILE EAST OF SR S27, Jasper, IA
Built 1959 Load: 38.6 t ADT: 18,050
NB US 65
FairOver: INDIAN CREEK
0.2 MILE S OF JCT IA 117, Jasper, IA
Built 1932 Load: 39.2 t ADT: 11,100
I 80 WB
FairOver: IA 224
AT JUNCTION IA 224, Jasper, IA
Built 1961 Load: 39.2 t ADT: 14,300
EB I-80
FairOver: INDIAN CREEK
2.6 MILES E OF JCT IA 117, Jasper, IA
Built 1960 Load: 39.4 t ADT: 17,250
WB I-80
FairOver: INDIAN CREEK
2.6 MILES E OF JCT IA 117, Jasper, IA
Built 1960 Load: 39.4 t ADT: 17,250
I 80 EB
FairOver: IA 224
AT JUNCTION IA 224, Jasper, IA
Built 1961 Load: 41.4 t ADT: 14,300
WB I-80
FairOver: WEST 148TH STREET SOUTH
1.0 MILE EAST OF SR S27, Jasper, IA
Built 1959 Load: 41.5 t ADT: 18,050
WB I-80
FairOver: OVER IAIS RR
0.4 MILES WEST OF JCT 14, Jasper, IA
Built 1962 Load: 42.6 t ADT: 16,700
I 80 WB
FairOver: IOWA SPEEDWAY DR
4.0 mi. E of Jct. IA 14, Jasper, IA
Built 1962 Load: 43.3 t ADT: 13,200
S 60TH AVE W
FairOver: SEWER CREEK
079192801, Jasper, IA
Built 1989 Load: 45.4 t ADT: 800
HIGHWAY S-74 S
FairOver: REASONER CREEK
78191102, Jasper, IA
Built 1996 Load: 45.4 t ADT: 810
IA 14
FairOver: STREAM
1.2 MILES S OF JCT SR F17, Jasper, IA
Built 1988 Load: 45.5 t ADT: 1,820
S 96TH AVE W
FairOver: CALHOUN CREEK
078201801, Jasper, IA
Built 2004 Load: 47.8 t ADT: 60
FM
FairOver: ALLOWAY CREEK
080180401, Jasper, IA
Built 1991 Load: 48.2 t ADT: 40
EB I-80
FairOver: ROCK CREEK
3.2 MI. E OF JCT. IA 224, Jasper, IA
Built 1962 Load: 48.3 t ADT: 14,600
LOCAL
FairOver: SMALL STREAM
080180203, Jasper, IA
Built 2003 Load: 49.1 t ADT: 16
WB I-80
FairOver: ROCK CREEK
3.2 MI. E OF JCT. IA 224, Jasper, IA
Built 1962 Load: 49.3 t ADT: 14,600
LOCAL
FairOver: ROCK CREEK
081172803, Jasper, IA
Built 2007 Load: 49.5 t ADT: 16
US 65
FairOver: WOLF CREEK
1.1 MILES N OF JCT IA 117, Jasper, IA
Built 1985 Load: 55.8 t ADT: 1,900
FM
FairOver: SMALL CREEK
080170703, Jasper, IA
Built 1966 Load: 99.9 t ADT: 360
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.