Total bridges
291
Public highway bridges in Scott County
County profile · official public datasets
Scott County, IA
291 public highway bridges tracked in the FHWA National Bridge Inventory: 34.7% rated Good, 55% Fair, 10.3% Poor.
- 291
- Public bridges
- 34.7%
- Good condition
- 10.3%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Scott County posts a top-quartile lowest Poor-condition share among rated counties in the state across mid-size county bridge inventory.
- Top 22%
- lowest Poor share in state
- 10.3%
- Poor-condition share
- 291
- 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.
Scott County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Scott County ranks #22 of 99 Iowa counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 10.3%). Scott County, Iowa contains 291 public highway bridges. Roughly 34.7% are rated “Good,” 55% “Fair,” and 10.3% “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.
Good condition
34.7%
101 of 291 rated 7-9
Fair condition
55%
160 of 291 rated 5-6
Poor condition
10.3%
30 of 291 rated 4 or below
In-state Poor-share rank
#22 of 99
Among Iowa counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 291 NBI-tracked bridges by lowest applicable component rating.
Good 34.7% (101)
Fair 55% (160)
Poor 10.3% (30)
Scott County's Poor-condition bridges carry 80,403 vehicle crossings a day
That is 4.6% of the county's reported daily bridge traffic on 10.3% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 2,680 crossings a day against 4,957 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 291 of 291 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
44.3% of Scott County's bridges have passed the 50-year mark
129 of the 291 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 34.7% 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 33% of the county's Poor-condition bridge traffic
US 67 over MISS RVR RR & IA 461, built 1940, carries 26,500 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 30-bridge count understates how much of the daily burden sits on a single crossing.
Share is of the 80,403 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When Scott County's bridges were built
291 bridges with a recorded construction year, grouped by decade
- 1900s 6
1900–1909
6 bridges
- 1920s 5
1920–1929
5 bridges
- 1930s 2
1930–1939
2 bridges
- 1940s 4
1940–1949
4 bridges
- 1950s
1950–1959
23 bridges
- 1960s
1960–1969
54 bridges
- 1970s
1970–1979
46 bridges
- 1980s
1980–1989
45 bridges
- 1990s
1990–1999
43 bridges
- 2000s 19
2000–2009
19 bridges
- 2010s
2010–2019
27 bridges
- 2020s 17
2020–2029
17 bridges
What this shows Construction peaked in the 1960s, when 54 of the county's bridges still in the inventory were built, which is 18.6% of those with a recorded year. That cohort is now 55 to 64 years old in the 2024 inventory. Its average build year (1980) matches the Iowa average (1979).
How Scott County compares with Iowa's closest counties by inventory size
The 5 Iowa counties nearest Scott County in number of bridges, with their condition splits. Its 10.3% Poor share is the 2nd-lowest of these 6. Its average build year of 1980 against a peer-group mean of 1979 is in line with the group.
Showing the 5 closest of 98 Iowa counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Story County | 296 | 33.1% | 53% | 13.9% | 1968 |
| Cass County | 295 | 25.4% | 41% | 33.6% | 1976 |
| Delaware County | 293 | 39.2% | 53.9% | 6.8% | 1981 |
| Scott County (this page) | 291 | 34.7% | 55% | 10.3% | 1980 |
| Butler County | 289 | 58.1% | 26.6% | 15.2% | 1985 |
| Grundy County | 289 | 42.6% | 32.9% | 24.6% | 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 Scott 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 Scott County, both outside Iowa so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside IA (291 bridges here).
- Macon County, MO · 291 bridges
- Pickens County, SC · 291 bridges
- Canyon County, ID · 292 bridges
- Hancock County, IL · 292 bridges
Similar average build year
Nearest mean year-built outside IA (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.
Fair-condition bridges (160)
WISCONSIN AVE
FairOver: CARDINAL CREEK
000000000, Scott, IA
Built 1960 Load: 35.0 t ADT: 930
NB US 61
FairOver: WAPSIPINICON RIVER
2.4 mi. N of SR F33, Scott, IA
Built 1981 Load: 35.0 t ADT: 8,800
SB US 61
FairOver: WAPSIPINICON RIVER
2.4 mi. N of S.R. F33, Scott, IA
Built 1981 Load: 35.6 t ADT: 8,800
RAMP US 61
FairOver: 210TH ST
1.1 MI. N OF JCT. I-80, Scott, IA
Built 1981 Load: 35.6 t ADT: 1,900
230TH AVE
FairOver: BR LOST CREEK
079E41204, Scott, IA
Built 1992 Load: 35.7 t ADT: 370
170TH ST
FairOver: CREEK
078E22101, Scott, IA
Built 1993 Load: 35.9 t ADT: 25
BLACKHAWK TRAIL
FairOver: US 61
2.1 MI. N OF JCT. I-80, Scott, IA
Built 1981 Load: 36.2 t ADT: 2,963
US 6
FairOver: SILVER CREEK
2.2 MI. W OF JCT. US 61, Scott, IA
Built 1983 Load: 36.3 t ADT: 22,200
I-280 (EB)
FairOver: DUCK CREEK
3.4 MI. S OF JCT. I-80, Scott, IA
Built 1972 Load: 36.3 t ADT: 11,750
1ST AVE
FairOver: BR MUD CREEK
079E10702, Scott, IA
Built 1988 Load: 36.6 t ADT: 71
US 6
FairOver: I-280 & US 61
0.8 MI.E.OF JCT I-80/280, Scott, IA
Built 1971 Load: 36.7 t ADT: 6,000
IA 22
FairOver: MOORE CREEK
3.4 mi. W of Jct. I-280, Scott, IA
Built 1972 Load: 37.0 t ADT: 3,830
I-280 WB
FairOver: EB I-80
AT JCT. I-280, Scott, IA
Built 1960 Load: 37.0 t ADT: 4,990
30TH AVE
FairOver: CREEK
079E12702, Scott, IA
Built 1993 Load: 37.3 t ADT: 15
220TH AVE
FairOver: CREEK
079E42901, Scott, IA
Built 1921 Load: 37.3 t ADT: 150
288TH ST
FairOver: MUD CREEK OVERFLOW
080E22205, Scott, IA
Built 1991 Load: 37.3 t ADT: 45
LOCAL
FairOver: SMALL STREAM
079E13402, Scott, IA
Built 1993 Load: 37.3 t ADT: 71
W LOCUST ST
FairOver: I-280
2.0 mi. N of Jct. US 61, Scott, IA
Built 1971 Load: 37.4 t ADT: 7,000
ALLENS GROVE RD
FairOver: MUD CREEK
080E22903, Scott, IA
Built 1987 Load: 37.6 t ADT: 550
I-80
FairOver: MISSISSIPPI RIVER & RR
IN LECLAIRE, Scott, IA
Built 1967 Load: 37.9 t ADT: 37,100
NB US 61
FairOver: CROW CREEK
1.6 MI. N OF JCT. I-80, Scott, IA
Built 1981 Load: 37.9 t ADT: 17,750
I-74 WB
FairOver: I 80
At jct. I-80, Scott, IA
Built 1967 Load: 38.0 t ADT: 7,350
I 80 EB
FairOver: MIDDLE RD
3.6 MI. E OF JCT. I-74, Scott, IA
Built 1963 Load: 38.0 t ADT: 15,400
LOCAL
FairOver: DRAINAGE
079E30208, Scott, IA
Built 1996 Load: 38.0 t ADT: 11
300TH ST
FairOver: CONTENTION CREEK
080E31801, Scott, IA
Built 2004 Load: 38.1 t ADT: 20
90TH ST
FairOver: CREEK
078E21502, Scott, IA
Built 1997 Load: 38.8 t ADT: 35
RIVER CAMP RD
FairOver: MUD CREEK OVERFLOW
080E21503, Scott, IA
Built 1991 Load: 38.8 t ADT: 290
RIVER CAMP RD
FairOver: MUD CREEK OVERFLOW
080E21403, Scott, IA
Built 1991 Load: 38.9 t ADT: 290
CO RD Y-68
FairOver: WAPSIPINICON RIVER
080E40604, Scott, IA
Built 1965 Load: 39.0 t ADT: 2,310
I-74 EB
FairOver: I 80
At jct. I-80, Scott, IA
Built 1967 Load: 39.7 t ADT: 7,350
SB US 61
FairOver: 210TH ST
1.1 MI. N OF JCT. I-80, Scott, IA
Built 1981 Load: 40.0 t ADT: 15,250
I 80 WB
FairOver: MIDDLE RD
3.6 MI. E OF JCT I-74, Scott, IA
Built 1963 Load: 40.1 t ADT: 15,400
DEVILS GLEN RD
FairOver: DUCK CREEK
Bettendorf IA, Scott, IA
Built 1981 Load: 40.5 t ADT: 8,800
SB US 61
FairOver: WAPSIPINICON BAYOU
1.8 MI. N OF SR F 33, Scott, IA
Built 1981 Load: 41.2 t ADT: 8,800
250TH ST
FairOver: LOST CREEK
079E50701, Scott, IA
Built 1985 Load: 41.5 t ADT: 80
S CLARK ST
FairOver: BLACKHAWK CREEK
000000000, Scott, IA
Built 1950 Load: 41.7 t ADT: 2,351
I-74 EB
FairOver: MIDDLE RD
1.0 MI. E OF JCT. US 6, Scott, IA
Built 1971 Load: 42.2 t ADT: 25,050
I 280 WB
FairOver: IA 22
At jct. IA 22, Scott, IA
Built 1970 Load: 42.3 t ADT: 9,600
I 280 EB
FairOver: IA 22
At the Jct. of Iowa 22, Scott, IA
Built 1970 Load: 42.3 t ADT: 9,600
US 67
FairOver: CROW CREEK
5.2 mi. S of Jct. I-80, Scott, IA
Built 1996 Load: 43.9 t ADT: 9,800
UTAH AVE
FairOver: BLACKHAWK CREEK
000000000, Scott, IA
Built 1960 Load: 44.6 t ADT: 851
60TH AVE
FairOver: CREEK
080E23102, Scott, IA
Built 1998 Load: 45.7 t ADT: 1,280
US 61 NB
FairOver: 267TH ST
At the Jct. SR F41, Scott, IA
Built 1981 Load: 45.8 t ADT: 8,450
US 61 SB
FairOver: 267TH ST
At Jct. SR F41, Scott, IA
Built 1981 Load: 45.8 t ADT: 8,450
172ND AVE
FairOver: CREEK
080E32506, Scott, IA
Built 1958 Load: 46.0 t ADT: 34
PLAINVIEW RD
FairOver: I-80(WALCOTT)
Jct of I-80 & Y40, Scott, IA
Built 1992 Load: 46.3 t ADT: 6,900
E 53RD ST
FairOver: GOOSE CREEK
000000000, Scott, IA
Built 1978 Load: 46.7 t ADT: 21,241
US 61 NB
FairOver: LECLAIRE RD
4.2 MI. N OF JCT. I-80, Scott, IA
Built 1981 Load: 46.7 t ADT: 9,750
US 61 SB
FairOver: LECLAIRE RD&BIKEPATH
4.2 MI. N OF JCT. I-80, Scott, IA
Built 1981 Load: 46.7 t ADT: 9,750
FM
FairOver: CREEK
080E33607, Scott, IA
Built 1956 Load: 47.0 t ADT: 4,750
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.