Total bridges
71
Public highway bridges in Nez Perce County
County profile · official public datasets
Nez Perce County, ID
71 public highway bridges tracked in the FHWA National Bridge Inventory: 28.2% rated Good, 69% Fair, 2.8% Poor.
- 71
- Public bridges
- 28.2%
- Good condition
- 2.8%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Nez Perce County posts a better-than-median Poor-condition share among rated counties in the state across rated county bridge inventory.
- Top 27%
- lowest Poor share in state
- 2.8%
- Poor-condition share
- 71
- 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.
Nez Perce County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Nez Perce County ranks #12 of 44 Idaho counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 2.8%). Nez Perce County, Idaho contains 71 public highway bridges. Roughly 28.2% are rated “Good,” 69% “Fair,” and 2.8% “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
28.2%
20 of 71 rated 7-9
Fair condition
69%
49 of 71 rated 5-6
Poor condition
2.8%
2 of 71 rated 4 or below
In-state Poor-share rank
#12 of 44
Among Idaho counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 71 NBI-tracked bridges by lowest applicable component rating.
Good 28.2% (20)
Fair 69% (49)
Poor 2.8% (2)
Nez Perce County's Poor-condition bridges carry 580 vehicle crossings a day
That is 0.3% of the county's reported daily bridge traffic on 2.8% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 290 crossings a day against 1,637 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 71 of 71 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
45.1% of Nez Perce County's bridges have passed the 50-year mark
32 of the 71 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 28.2% 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 69% of the county's Poor-condition bridge traffic
LENORE GRADE ROAD over CLEARWATER R;LENORE BR., built 1935, carries 400 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 2-bridge count understates how much of the daily burden sits on a single crossing.
Share is of the 580 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When Nez Perce County's bridges were built
71 bridges with a recorded construction year, grouped by decade
- 1900s 1
1900–1909
1 bridges
- 1920s 4
1920–1929
4 bridges
- 1930s
1930–1939
7 bridges
- 1940s 3
1940–1949
3 bridges
- 1950s 2
1950–1959
2 bridges
- 1960s
1960–1969
11 bridges
- 1970s
1970–1979
8 bridges
- 1980s
1980–1989
11 bridges
- 1990s
1990–1999
7 bridges
- 2000s 3
2000–2009
3 bridges
- 2010s
2010–2019
12 bridges
- 2020s 2
2020–2029
2 bridges
What this shows Construction peaked in the 2010s, when 12 of the county's bridges still in the inventory were built, which is 16.9% 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 Idaho average (1979).
How Nez Perce County compares with Idaho's closest counties by inventory size
The 5 Idaho counties nearest Nez Perce County in number of bridges, with their condition splits. Its 2.8% Poor share is the 3rd-lowest of these 6. Its average build year of 1977 against a peer-group mean of 1974 is in line with the group.
Showing the 5 closest of 43 Idaho counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Gooding County | 80 | 16.3% | 76.3% | 7.5% | 1965 |
| Madison County | 80 | 30% | 70% | 0% | 1981 |
| Nez Perce County (this page) | 71 | 28.2% | 69% | 2.8% | 1977 |
| Power County | 70 | 28.6% | 68.6% | 2.9% | 1973 |
| Minidoka County | 66 | 28.8% | 71.2% | 0% | 1983 |
| Payette County | 65 | 13.8% | 81.5% | 4.6% | 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 Nez Perce 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 Nez Perce County, both outside Idaho so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside ID (71 bridges here).
- Rio Grande County, CO · 71 bridges
- Charlton County, GA · 71 bridges
- Madison County, GA · 71 bridges
- Taylor County, GA · 71 bridges
Similar average build year
Nearest mean year-built outside ID (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 (49)
LULU STREET
FairOver: BIG CANYON CREEK
IN PECK;NE SECTION, Nez Perce, ID
Built 1920 Load: 4.5 t ADT: 50
SPERRY GRADE RD
FairOver: POTLATCH RVR(SPERRY BR)
AT KENDRICK SCL, Nez Perce, ID
Built 1908 Load: 6.4 t ADT: 170
CEDAR ROAD
FairOver: COTTONWOOD CREEK
0.7 S. 1.2 E. MYRTLE, Nez Perce, ID
Built 1929 Load: 8.2 t ADT: 20
LITTLE CANYON ROAD
FairOver: BIG CANYON CREEK
0.4 S. 0.3 E. PECK, Nez Perce, ID
Built 1930 Load: 9.1 t ADT: 190
SMA7334;GUN CLB RD
FairOver: LINDSAY CREEK
IN LEWISTON;GUN CLUB RD., Nez Perce, ID
Built 1971 Load: 10.9 t ADT: 5,300
STC 4751;CTTNWD CR
FairOver: COYOTE CREEK
3.1 S. 3.0 E. MYRTLE, Nez Perce, ID
Built 1938 Load: 11.8 t ADT: 40
STC 4751;3RD ST.
FairOver: LAPWAI CREEK
AT CULDESAC WCL;3RD ST., Nez Perce, ID
Built 1983 Load: 11.8 t ADT: 240
RIVER ROAD
FairOver: PINE CREEK
1.7 N. 3.6 E. MYRTLE, Nez Perce, ID
Built 1929 Load: 12.7 t ADT: 30
STC 4747;CNTRL RDG
FairOver: BIG CANYON CREEK
0.3 S. PECK, Nez Perce, ID
Built 1948 Load: 13.6 t ADT: 30
MISSION CREEK ROAD
FairOver: MISSION CREEK
3.1 S. JACQUES SPUR, Nez Perce, ID
Built 1947 Load: 13.6 t ADT: 170
LEON ROAD
FairOver: UNION FLAT CREEK
1.5 S. 5.3 W. GENESEE, Nez Perce, ID
Built 1938 Load: 14.5 t ADT: 40
HELLS GATE RD
FairOver: TAMMANY CREEK
IN HELLS GATE STATE PARK, Nez Perce, ID
Built 1959 Load: 14.5 t ADT: 330
MOSER ROAD
FairOver: COW CREEK
1.5 S. 4.4 W. GENESEE, Nez Perce, ID
Built 1970 Load: 17.2 t ADT: 30
US 12
FairOver: US 12;SNAKE RIVER
IN LEWISTON AT STATE LINE, Nez Perce, ID
Built 1939 Load: 19.1 t ADT: 19,500
STC4755;TAMMANY CR
FairOver: TAMMANY CREEK
0.3 S. LEWISTON SCL, Nez Perce, ID
Built 1987 Load: 20.0 t ADT: 2,600
STC4751;CTTNWD CRK
FairOver: COTTONWOOD CREEK
3.8 N. 0.8 E. CULDESAC, Nez Perce, ID
Built 1968 Load: 20.0 t ADT: 40
US 12
FairOver: CLWATER R.;NPRR;ARROW BR
10.4 E. LEWISTON, Nez Perce, ID
Built 1972 Load: 21.8 t ADT: 4,700
LYLE GULCH
FairOver: LAPWAI CR;JACQUES SPUR B
0.3 S. 2.3 W. CULDESAC, Nez Perce, ID
Built 1987 Load: 24.3 t ADT: 50
CENTRAL GRADE ROAD
FairOver: HATWAI CREEK
2.2 N. 3.0 E. LEWISTON, Nez Perce, ID
Built 1968 Load: 24.5 t ADT: 650
ENTRANCE ROAD
FairOver: LAPWAI CREEK
1.4 miles southeast of Jc, Nez Perce, ID
Built 1988 Load: 24.5 t ADT: 225
MORSCHECK ROAD
FairOver: COW CREEK;LAGOON BR
0.6 S. 0.5 W. GENESEE, Nez Perce, ID
Built 1932 Load: 25.4 t ADT: 30
US 12
FairOver: CLEARWATER RIVER;BNRR
IN LEWISTON, Nez Perce, ID
Built 1951 Load: 26.3 t ADT: 25,000
US 95
FairOver: US 95 RAMP;WASHINGTON IC
3.0 N. LEWISTON, Nez Perce, ID
Built 1980 Load: 28.1 t ADT: 5,800
HIGHLINE ARROW RD
FairOver: POTLATCH R(ARROW JCT BR)
2.2 N. 2.3 E. SPALDING, Nez Perce, ID
Built 1920 Load: 29.0 t ADT: 90
SH 3
FairOver: ARROW GULCH
8 S. JULIAETTA, Nez Perce, ID
Built 1968 Load: 31.8 t ADT: 2,200
SMA7344;BRYDEN CYN
FairOver: SNAKE R;HIGH/SOUTHWAY BR
IN LEWISTON;BRYDEN EXT, Nez Perce, ID
Built 1982 Load: 32.7 t ADT: 21,000
US 95 SBL
FairOver: COW CREEK
15.2 N LEWISTON, Nez Perce, ID
Built 2007 Load: 34.5 t ADT: 3,000
US 95 NBL
FairOver: COW CREEK
15.2 N. LEWISTON, Nez Perce, ID
Built 2007 Load: 34.5 t ADT: 3,000
US 95
FairOver: LAPWAI CREEK
2.4 S. CULDESAC, Nez Perce, ID
Built 2012 Load: 34.7 t ADT: 3,500
US 95
FairOver: LAPWAI CREEK
2.6 S. CULDESAC, Nez Perce, ID
Built 2012 Load: 35.3 t ADT: 3,500
US 95RAMP SB
FairOver: US 12 WB; LEWISTON IC
AT LEWISTON NCL, Nez Perce, ID
Built 1977 Load: 37.2 t ADT: 800
US 95
FairOver: LAPWAI CREEK
3.0 S. CULDESAC, Nez Perce, ID
Built 2012 Load: 37.9 t ADT: 3,500
US 95
FairOver: LAPWAI CREEK
1 N. LAPWAI, Nez Perce, ID
Built 1964 Load: 39.9 t ADT: 6,800
US 95
FairOver: LAPWAI CREEK
SPAULDING CITY LIMITS, Nez Perce, ID
Built 1964 Load: 39.9 t ADT: 6,800
US 95
FairOver: US 12;US 12-95 IC
6.1 E. LEWISTON, Nez Perce, ID
Built 1964 Load: 39.9 t ADT: 11,000
US 95
FairOver: NPRR;CLEARWATER RIVER
4 N. LAPWAI, Nez Perce, ID
Built 1962 Load: 40.8 t ADT: 6,200
US 12
FairOver: COTTONWOOD CREEK
14.6 E. LEWISTON, Nez Perce, ID
Built 1997 Load: 41.7 t ADT: 4,700
STC4745;GIFRD RUBN
FairOver: COTTONWOOD CREEK
0.6 SE. MYRTLE, Nez Perce, ID
Built 1976 Load: 41.7 t ADT: 520
US 95
FairOver: LAPWAI CREEK
4.1 S. CULDESAC, Nez Perce, ID
Built 2012 Load: 42.1 t ADT: 3,500
US 95
FairOver: LAPWAI CREEK
2.1 S. CULDESAC, Nez Perce, ID
Built 2012 Load: 42.1 t ADT: 3,500
US 95
FairOver: LAPWAI CREEK
1.8 S. CULDESAC, Nez Perce, ID
Built 2012 Load: 42.1 t ADT: 3,500
US 95
FairOver: LAPWAI CREEK
1.0 S. CULDESAC, Nez Perce, ID
Built 2012 Load: 42.1 t ADT: 3,500
RED DUCK LANE
FairOver: LAPWAI CREEK
1.5 N. 0.2 W. LAPWAI, Nez Perce, ID
Built 1963 Load: 42.6 t ADT: 110
STC4759;WEBB RD
FairOver: SWEETWATER CREEK
2.0 SW SWEETWATER, Nez Perce, ID
Built 1949 Load: 44.5 t ADT: 2,000
US 95 RAMP NBL
FairOver: US 95R SBL;LEWISTON IC
AT LEWISTON NCL, Nez Perce, ID
Built 1977 Load: 51.7 t ADT: 4,300
SMA 7134;8TH ST.
FairOver: BRYDEN CANYON ROAD
IN LEWISTON, Nez Perce, ID
Built 1999 Load: 57.2 t ADT: 4,000
SLICKPOO ROAD
FairOver: MISSION CR;M.WITTMAN BR
3.8 S. 1.6 W. CULDESAC, Nez Perce, ID
Built 1987 Load: 67.1 t ADT: 50
US 95
FairOver: HATWAI CREEK
2.7 E. LEWISTON, Nez Perce, ID
Built 1979 Load: 99.9 t ADT: 5,500
SMA 7124;E MAIN ST
FairOver: LINDSAY CREEK
IN LEWISTON, Nez Perce, ID
Built 1997 Load: 99.9 t ADT: 5,700
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.