Total bridges
168
Public highway bridges in Greene County
County profile · official public datasets
Greene County, IA
168 public highway bridges tracked in the FHWA National Bridge Inventory: 35.1% rated Good, 50% Fair, 14.9% Poor.
- 168
- Public bridges
- 35.1%
- Good condition
- 14.9%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Greene County pairs a better-than-median Poor-condition share among rated counties in the state with an older average build year than the state inventory.
- Top 33%
- lowest Poor share in state
- 14.9%
- Poor-condition share
- 168
- 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.
Greene County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Greene County ranks #33 of 99 Iowa counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 14.9%). Greene County, Iowa contains 168 public highway bridges. Roughly 35.1% are rated “Good,” 50% “Fair,” and 14.9% “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
35.1%
59 of 168 rated 7-9
Fair condition
50%
84 of 168 rated 5-6
Poor condition
14.9%
25 of 168 rated 4 or below
In-state Poor-share rank
#33 of 99
Among Iowa counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 168 NBI-tracked bridges by lowest applicable component rating.
Good 35.1% (59)
Fair 50% (84)
Poor 14.9% (25)
Greene County's Poor-condition bridges carry 3,693 vehicle crossings a day
That is 5.2% of the county's reported daily bridge traffic on 14.9% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 148 crossings a day against 682 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 168 of 168 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
44% of Greene County's bridges have passed the 50-year mark
74 of the 168 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 35.1% 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 42.6% of the county's Poor-condition bridge traffic
S GRIMMELL RD over RACCOON RIVER, built 1947, carries 1,572 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 25-bridge count understates how much of the daily burden sits on a single crossing.
Share is of the 3,693 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When Greene County's bridges were built
168 bridges with a recorded construction year, grouped by decade
- 1900s 2
1900–1909
2 bridges
- 1910s 4
1910–1919
4 bridges
- 1920s 7
1920–1929
7 bridges
- 1930s 8
1930–1939
8 bridges
- 1940s 8
1940–1949
8 bridges
- 1950s
1950–1959
24 bridges
- 1960s 11
1960–1969
11 bridges
- 1970s
1970–1979
30 bridges
- 1980s
1980–1989
29 bridges
- 1990s
1990–1999
17 bridges
- 2000s
2000–2009
18 bridges
- 2010s 9
2010–2019
9 bridges
- 2020s 1
2020–2029
1 bridges
What this shows Construction peaked in the 1970s, when 30 of the county's bridges still in the inventory were built, which is 17.9% of those with a recorded year. That cohort is now 45 to 54 years old in the 2024 inventory. Its average build year is 1973, 6 years older than the Iowa average of 1979.
How Greene County compares with Iowa's closest counties by inventory size
The 5 Iowa counties nearest Greene County in number of bridges, with their condition splits. Its 14.9% Poor share is the 2nd-lowest of these 6. Its average build year of 1973 against a peer-group mean of 1978 is 5 years older.
Showing the 5 closest of 98 Iowa counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Union County | 169 | 30.2% | 37.3% | 32.5% | 1978 |
| Clarke County | 168 | 27.4% | 41.1% | 31.5% | 1977 |
| Greene County (this page) | 168 | 35.1% | 50% | 14.9% | 1973 |
| Mitchell County | 167 | 47.3% | 42.5% | 10.2% | 1980 |
| Davis County | 165 | 44.8% | 29.7% | 25.5% | 1985 |
| Hamilton County | 165 | 39.4% | 40% | 20.6% | 1970 |
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 Greene 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 Greene County, both outside Iowa so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside IA (168 bridges here).
- Wilcox County, AL · 168 bridges
- Kings County, CA · 168 bridges
- Carroll County, GA · 168 bridges
- Clayton County, GA · 168 bridges
Similar average build year
Nearest mean year-built outside IA (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.
Poor-condition bridges (25)
120 TH
PoorOver: STREAM
085321501, Greene, IA
Built 1957 Load: 11.9 t ADT: 26
180 TH
PoorOver: STREAM
084311401, Greene, IA
Built 1958 Load: 14.2 t ADT: 26
A AVE
PoorOver: DD 150-86
000000000, Greene, IA
Built 1964 Load: 17.3 t ADT: 293
180 TH
PoorOver: DD #102
084311701, Greene, IA
Built 1978 Load: 18.3 t ADT: 26
240 TH
PoorOver: BUTTRICKS CREEK
083301403, Greene, IA
Built 1957 Load: 18.6 t ADT: 26
300 TH
PoorOver: GREENBRIER CREEK
082311401, Greene, IA
Built 1957 Load: 18.8 t ADT: 15
290 TH / E57
PoorOver: WILLOW CREEK
082320703, Greene, IA
Built 1953 Load: 18.8 t ADT: 89
320 TH
PoorOver: STREAM
082322801, Greene, IA
Built 1956 Load: 18.8 t ADT: 11
140 TH
PoorOver: STREAM
085302701, Greene, IA
Built 1956 Load: 18.8 t ADT: 26
K AVE
PoorOver: HARDIN CREEK
085312302, Greene, IA
Built 1959 Load: 21.0 t ADT: 21
S GRIMMELL RD
PoorOver: RACCOON RIVER
D68000520, Greene, IA
Built 1947 Load: 21.5 t ADT: 1,572
A AVE / N58
PoorOver: RACCOON RIVER
084321802, Greene, IA
Built 1950 Load: 21.7 t ADT: 131
230 TH
PoorOver: STREAM
083310701, Greene, IA
Built 1957 Load: 23.6 t ADT: 46
FARM DRIVE
PoorOver: BUTTRICKS CREEK
085302302, Greene, IA
Built 1900 Load: 23.6 t ADT: 10
222ND ST
PoorOver: WEST BEAVER CREEK
083290303, Greene, IA
Built 1921 Load: 25.8 t ADT: 300
290 TH / E57
PoorOver: SNAKE CREEK
082291103, Greene, IA
Built 1959 Load: 27.6 t ADT: 108
100 TH
PoorOver: LOST GROVE CREEK
085290401, Greene, IA
Built 1914 Load: 27.8 t ADT: 21
W AVE
PoorOver: CREEK
082293504, Greene, IA
Built 1900 Load: 30.2 t ADT: 21
200 TH
PoorOver: CREEK
084323001, Greene, IA
Built 1956 Load: 31.7 t ADT: 35
330 TH / E63
PoorOver: DRAINAGE DITCH 9-13
082323101, Greene, IA
Built 1970 Load: 32.3 t ADT: 379
170 TH / E26
PoorOver: DRAINAGE DITCH 110
084300801, Greene, IA
Built 1963 Load: 32.7 t ADT: 229
200 TH
PoorOver: STREAM
084312801, Greene, IA
Built 1965 Load: 32.7 t ADT: 21
J AVE / P14
PoorOver: GREENBRIER CREEK
082310302, Greene, IA
Built 1971 Load: 33.0 t ADT: 190
280 TH
PoorOver: SNAKE CREEK
082290201, Greene, IA
Built 1916 Load: 39.0 t ADT: 41
X AVE
PoorOver: LITTLE BEAVER CREEK
084292502, Greene, IA
Built 1924 Load: 39.0 t ADT: 30
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.