Total bridges
21
Public highway bridges in Lewis County
County profile · official public datasets
Lewis County, ID
21 public highway bridges tracked in the FHWA National Bridge Inventory: 57.1% rated Good, 38.1% Fair, 4.8% Poor.
- 21
- Public bridges
- 57.1%
- Good condition
- 4.8%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Lewis County pairs a better-than-median Poor-condition share among rated counties in the state with a newer average build year than the state inventory.
- Top 50%
- lowest Poor share in state
- 4.8%
- Poor-condition share
- 21
- public highway bridges
- 1991
- 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.
Lewis County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Lewis County ranks #22 of 44 Idaho counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 4.8%). Lewis County, Idaho contains 21 public highway bridges. Roughly 57.1% are rated “Good,” 38.1% “Fair,” and 4.8% “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
57.1%
12 of 21 rated 7-9
Fair condition
38.1%
8 of 21 rated 5-6
Poor condition
4.8%
1 of 21 rated 4 or below
In-state Poor-share rank
#22 of 44
Among Idaho counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 21 NBI-tracked bridges by lowest applicable component rating.
Good 57.1% (12)
Fair 38.1% (8)
Poor 4.8% (1)
Lewis County's Poor-condition bridges carry 50 vehicle crossings a day
That is 0.1% of the county's reported daily bridge traffic on 4.8% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 50 crossings a day against 2,948 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 21 of 21 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
33.3% of Lewis County's bridges have passed the 50-year mark
7 of the 21 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 57.1% 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 100% of the county's Poor-condition bridge traffic
ACCESS RD; PARK RD over LAWYERS CREEK;PARK BR, built 1917, carries 50 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 1-bridge count understates how much of the daily burden sits on a single crossing.
Share is of the 50 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When Lewis County's bridges were built
21 bridges with a recorded construction year, grouped by decade
- 1910s 1
1910–1919
1 bridges
- 1920s 1
1920–1929
1 bridges
- 1950s 2
1950–1959
2 bridges
- 1960s
1960–1969
3 bridges
- 1990s
1990–1999
3 bridges
- 2000s 1
2000–2009
1 bridges
- 2010s
2010–2019
6 bridges
- 2020s
2020–2029
4 bridges
What this shows Construction peaked in the 2010s, when 6 of the county's bridges still in the inventory were built, which is 28.6% of those with a recorded year. That cohort is now 5 to 14 years old in the 2024 inventory. Its average build year is 1991, 12 years newer than the Idaho average of 1979.
How Lewis County compares with Idaho's closest counties by inventory size
The 5 Idaho counties nearest Lewis County in number of bridges, with their condition splits. Its 4.8% Poor share is the 4th-lowest of these 6. Its average build year of 1991 against a peer-group mean of 1978 is 13 years newer.
Showing the 5 closest of 43 Idaho counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Teton County | 37 | 43.2% | 51.4% | 5.4% | 1992 |
| Bear Lake County | 34 | 41.2% | 58.8% | 0% | 1985 |
| Butte County | 32 | 31.3% | 68.8% | 0% | 1969 |
| Franklin County | 23 | 13% | 78.3% | 8.7% | 1974 |
| Oneida County | 23 | 4.3% | 95.7% | 0% | 1972 |
| Lewis County (this page) | 21 | 57.1% | 38.1% | 4.8% | 1991 |
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 Lewis 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 Lewis County, both outside Idaho so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside ID (21 bridges here).
- Clay County, GA · 21 bridges
- Stanton County, KS · 21 bridges
- Montmorency County, MI · 21 bridges
- Lander County, NV · 21 bridges
Similar average build year
Nearest mean year-built outside ID (1991 here).
- Denver County, CO · avg 1991 · 458 bridges
- Baldwin County, AL · avg 1991 · 381 bridges
- Union County, NC · avg 1991 · 353 bridges
- Rock County, MN · avg 1991 · 265 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
All bridges (21)
MAPLE STREET
FairOver: LONG HOLLOW CREEK
IN NEZPERCE;MAPLE & 9TH., Lewis, ID
Built 1920 Load: 16.3 t ADT: 70
HOLMES CROSSING RD
FairOver: LAWYER CREEK
4.0 W. FERDINAND, Lewis, ID
Built 1965 Load: 18.1 t ADT: 20
SH 11
FairOver: CLEARWATER R.;GREER BR.
AT GREER WCL, Lewis, ID
Built 1954 Load: 23.6 t ADT: 1,300
SH 162
FairOver: LONG HOLLOW CREEK
AT NEZPERCE SCL, Lewis, ID
Built 1964 Load: 34.5 t ADT: 450
SH 162
FairOver: LAWYERS CANYON CREEK
5.1 S. NEZPERCE, Lewis, ID
Built 1964 Load: 43.5 t ADT: 450
US 12
FairOver: CLEARWATER R.(KAMIAH BR)
IN KAMIAH, Lewis, ID
Built 1998 Load: 46.3 t ADT: 5,900
US 95B
FairOver: LAPWAI CREEK
WINCHESTER SCL, Lewis, ID
Built 2002 Load: 55.3 t ADT: 530
US 95
FairOver: E.FK. LAPWAI CREEK
4.9 N. 1.0 E. WINCHESTER, Lewis, ID
Built 1957 Load: 99.9 t ADT: 3,500
MCCORMACK RDG RD
GoodOver: MISSION CREEK
3.5 S. 1.0 W. WINCHESTER, Lewis, ID
Built 2013 Load: 38.2 t ADT: 50
US 95
GoodOver: LAPWAI CREEK
2.4 N. 1.0 E. WINCHESTER, Lewis, ID
Built 2019 Load: 38.2 t ADT: 3,500
US 95
GoodOver: LAPWAI CREEK
2.0 N. 1.0 E. WINCHESTER, Lewis, ID
Built 2019 Load: 39.5 t ADT: 3,500
US 95
GoodOver: LAPWAI CREEK
2.4 N. 1.1 E. WINCHESTER, Lewis, ID
Built 2020 Load: 41.1 t ADT: 3,500
US 95
GoodOver: LAPWAI CREEK
1.6 N. 1.0 E. WINCHESTER, Lewis, ID
Built 2019 Load: 41.5 t ADT: 3,500
SH 64
GoodOver: LONG HOLLOW CREEK
IN NEZPERCE, Lewis, ID
Built 1999 Load: 49.9 t ADT: 520
US 95
GoodOver: LAPWAI CREEK
2.9 N. 1.3 E. WINCHESTER, Lewis, ID
Built 2020 Load: 49.9 t ADT: 3,500
US 95
GoodOver: LAPWAI CREEK
2.6 N. 1.0 E. WINCHESTER, Lewis, ID
Built 2020 Load: 50.2 t ADT: 3,500
US 95
GoodOver: LAPWAI CREEK
2.2 N. 1.0 E. WINCHESTER, Lewis, ID
Built 2019 Load: 51.5 t ADT: 3,500
US 95
GoodOver: LAPWAI CREEK
1.4 N. 1.0 E. WINCHESTER, Lewis, ID
Built 2019 Load: 61.2 t ADT: 3,500
US 95
GoodOver: LAPWAI CREEK
2.6 N. 1.2 E. WINCHESTER, Lewis, ID
Built 2020 Load: 70.3 t ADT: 3,500
US 95
GoodOver: DRAIN
1.6 S. CRAIGMONT, Lewis, ID
Built 1991 Load: 99.9 t ADT: 3,300
ACCESS RD; PARK RD
PoorOver: LAWYERS CREEK;PARK BR
3.0 S. 3.0 E. CRAIGMONT, Lewis, ID
Built 1917 Load: 10.9 t ADT: 50
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.