Total bridges
37
Public highway bridges in Teton County
County profile · official public datasets
Teton County, ID
37 public highway bridges tracked in the FHWA National Bridge Inventory: 43.2% rated Good, 51.4% Fair, 5.4% Poor.
- 37
- Public bridges
- 43.2%
- Good condition
- 5.4%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Teton County pairs a higher-than-median Poor-condition share among rated counties in the state with a newer average build year than the state inventory.
- 24th
- of 44 on Poor share
- 5.4%
- Poor-condition share
- 37
- public highway bridges
- 1992
- 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.
Teton County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Teton County ranks #24 of 44 Idaho counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 5.4%). Teton County, Idaho contains 37 public highway bridges. Roughly 43.2% are rated “Good,” 51.4% “Fair,” and 5.4% “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
43.2%
16 of 37 rated 7-9
Fair condition
51.4%
19 of 37 rated 5-6
Poor condition
5.4%
2 of 37 rated 4 or below
In-state Poor-share rank
#24 of 44
Among Idaho counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 37 NBI-tracked bridges by lowest applicable component rating.
Good 43.2% (16)
Fair 51.4% (19)
Poor 5.4% (2)
Teton County's Poor-condition bridges carry 5,560 vehicle crossings a day
That is 8.8% of the county's reported daily bridge traffic on 5.4% of its bridges: Poor-condition structures carry more traffic than their share of the inventory. Each Poor bridge averages 2,780 crossings a day against 1,771 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 37 of 37 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
13.5% of Teton County's bridges have passed the 50-year mark
5 of the 37 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 43.2% 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 98.9% of the county's Poor-condition bridge traffic
SH 33 over SPRING CREEK, built 1975, carries 5,500 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 2-bridge count understates how much of the daily burden sits on a single crossing.
Share is of the 5,560 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When Teton County's bridges were built
37 bridges with a recorded construction year, grouped by decade
- 1930s 1
1930–1939
1 bridges
- 1950s 2
1950–1959
2 bridges
- 1960s 2
1960–1969
2 bridges
- 1970s
1970–1979
6 bridges
- 1980s 3
1980–1989
3 bridges
- 1990s
1990–1999
6 bridges
- 2000s
2000–2009
10 bridges
- 2010s
2010–2019
7 bridges
What this shows Construction peaked in the 2000s, when 10 of the county's bridges still in the inventory were built, which is 27% of those with a recorded year. That cohort is now 15 to 24 years old in the 2024 inventory. Its average build year is 1992, 13 years newer than the Idaho average of 1979.
How Teton County compares with Idaho's closest counties by inventory size
The 5 Idaho counties nearest Teton County in number of bridges, with their condition splits. Its 5.4% Poor share is the 4th-lowest of these 6. Its average build year of 1992 against a peer-group mean of 1979 is 13 years newer.
Showing the 5 closest of 43 Idaho counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Benewah County | 47 | 21.3% | 74.5% | 4.3% | 1978 |
| Caribou County | 45 | 26.7% | 66.7% | 6.7% | 1985 |
| Clark County | 40 | 22.5% | 65% | 12.5% | 1977 |
| Teton County (this page) | 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 |
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 Teton 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 Teton County, both outside Idaho so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside ID (37 bridges here).
- Sitka City and County, AK · 37 bridges
- Suwannee County, FL · 37 bridges
- Dickinson County, MI · 37 bridges
- Emmet County, MI · 37 bridges
Similar average build year
Nearest mean year-built outside ID (1992 here).
- Johnson County, KS · avg 1992 · 781 bridges
- Wake County, NC · avg 1992 · 760 bridges
- Benton County, AR · avg 1992 · 410 bridges
- Nodaway County, MO · avg 1992 · 396 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
Fair-condition bridges (19)
10000 NORTH RD
FairOver: BADGER CREEK
3.8 N. 1.5 W. TETONIA, Teton, ID
Built 1977 Load: 20.9 t ADT: 100
S6810;PACKSADDLE R
FairOver: SIDE CHANNEL TETON RIVER
2.2 S. 2.7 W. TETONIA, Teton, ID
Built 1935 Load: 20.9 t ADT: 250
OLD JACKSON HWY
FairOver: GAME CREEK
1.8 S. 1.8 E. VICTOR, Teton, ID
Built 2001 Load: 20.9 t ADT: 60
N 2000 W
FairOver: SPRING CR;N.FK.LEIGH CR
0.5 S. 1.0 E. TETONIA, Teton, ID
Built 1984 Load: 20.9 t ADT: 100
ROAD
FairOver: TRAIL CREEK
NO DATA ENTERED, Teton, ID
Built 1965 Load: 21.7 t ADT: 50
ROAD
FairOver: MOOSE CREEK
NO DATA ENTERED, Teton, ID
Built 1975 Load: 23.3 t ADT: 24
5750 SOUTH
FairOver: TETON RIVER(WHITE BR)
2.6 N. 3.2 W. VICTOR, Teton, ID
Built 1983 Load: 23.6 t ADT: 190
9500 SOUTH
FairOver: TRAIL CREEK
1.2 S. 1.0 E. VICTOR, Teton, ID
Built 1952 Load: 26.3 t ADT: 120
S6810;PACKSADDLE R
FairOver: TETON RIVER(CACHE BR)
2.1 S. 2.5 W. TETONIA, Teton, ID
Built 1956 Load: 27.2 t ADT: 250
CEMETARY ROAD
FairOver: TETON CREEK
1.1 E DRIGGS, Teton, ID
Built 2004 Load: 28.1 t ADT: 1,500
TRAIL CREEK ROAD
FairOver: TRAIL CREEK
IN VICTOR, Teton, ID
Built 2009 Load: 28.1 t ADT: 10
SH 33
FairOver: S.FK.LEIGH CREEK
2.8 S. TETONIA, Teton, ID
Built 1979 Load: 29.9 t ADT: 5,500
STATELINE RD;WY16
FairOver: GRAND TETON CANAL
1 Mi West of Alta, Teton, ID
Built 2005 Load: 32.7 t ADT: 2,300
SH 33
FairOver: TETON CREEK
1.1 S. DRIGGS, Teton, ID
Built 1979 Load: 37.2 t ADT: 9,000
STC 6820;BUXTON RD
FairOver: TETON RIVER
3.8 W. DRIGGS, Teton, ID
Built 1996 Load: 38.1 t ADT: 930
SH 32
FairOver: BITCH CREEK
10 NW TETONIA, Teton, ID
Built 2002 Load: 43.5 t ADT: 880
RAMMEL MOUNTAIN RD
FairOver: BADGER CREEK
4.1 N. 2.3 E. TETONIA, Teton, ID
Built 1991 Load: 49.0 t ADT: 80
SH 31
FairOver: TRAIL CREEK;VICTOR BR
0.3 S. VICTOR, Teton, ID
Built 1996 Load: 50.8 t ADT: 6,100
CEMETARY ROAD
FairOver: TETON CREEK
1.3 E. DRIGGS, Teton, ID
Built 2009 Load: 72.6 t ADT: 1,500
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.