Total bridges
308
Public highway bridges in Kittitas County
County profile · official public datasets
Kittitas County, WA
308 public highway bridges tracked in the FHWA National Bridge Inventory: 39% rated Good, 50.6% Fair, 10.4% Poor.
- 308
- Public bridges
- 39%
- Good condition
- 10.4%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Kittitas County posts a higher-than-median Poor-condition share among rated counties in the state across mid-size county bridge inventory.
- 35th
- of 39 on Poor share
- 10.4%
- Poor-condition share
- 308
- 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.
Kittitas County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Kittitas County ranks #35 of 39 Washington counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 10.4%). Kittitas County, Washington contains 308 public highway bridges. Roughly 39% are rated “Good,” 50.6% “Fair,” and 10.4% “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
39%
120 of 308 rated 7-9
Fair condition
50.6%
156 of 308 rated 5-6
Poor condition
10.4%
32 of 308 rated 4 or below
In-state Poor-share rank
#35 of 39
Among Washington counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 308 NBI-tracked bridges by lowest applicable component rating.
Good 39% (120)
Fair 50.6% (156)
Poor 10.4% (32)
Kittitas County's Poor-condition bridges carry 286,199 vehicle crossings a day
That is 16.4% of the county's reported daily bridge traffic on 10.4% of its bridges: Poor-condition structures carry more traffic than their share of the inventory. Each Poor bridge averages 8,944 crossings a day against 5,739 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 308 of 308 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
64.6% of Kittitas County's bridges have passed the 50-year mark
199 of the 308 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 39% 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 12% of the county's Poor-condition bridge traffic
I-90 over SR 906, built 1969, carries 34,348 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 32-bridge count understates how much of the daily burden sits on a single crossing.
Share is of the 286,199 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When Kittitas County's bridges were built
308 bridges with a recorded construction year, grouped by decade
- 1900s 1
1900–1909
1 bridges
- 1910s 1
1910–1919
1 bridges
- 1920s 5
1920–1929
5 bridges
- 1930s 32
1930–1939
32 bridges
- 1940s 7
1940–1949
7 bridges
- 1950s 30
1950–1959
30 bridges
- 1960s
1960–1969
96 bridges
- 1970s
1970–1979
43 bridges
- 1980s 9
1980–1989
9 bridges
- 1990s 22
1990–1999
22 bridges
- 2000s 19
2000–2009
19 bridges
- 2010s 36
2010–2019
36 bridges
- 2020s 7
2020–2029
7 bridges
What this shows Construction peaked in the 1960s, when 96 of the county's bridges still in the inventory were built, which is 31.2% of those with a recorded year. That cohort is now 55 to 64 years old in the 2024 inventory. Its average build year (1973) matches the Washington average (1975).
How Kittitas County compares with Washington's closest counties by inventory size
The 5 Washington counties nearest Kittitas County in number of bridges, with their condition splits. Its 10.4% Poor share is the 6th-lowest of these 6. Its average build year of 1973 against a peer-group mean of 1973 is in line with the group.
Showing the 5 closest of 38 Washington counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Whatcom County | 354 | 44.1% | 50.6% | 5.4% | 1970 |
| Whitman County | 347 | 52.2% | 44.4% | 3.5% | 1974 |
| Kittitas County (this page) | 308 | 39% | 50.6% | 10.4% | 1973 |
| Spokane County | 307 | 51.1% | 42% | 6.8% | 1978 |
| Grant County | 306 | 63.7% | 33.7% | 2.6% | 1973 |
| Skagit County | 254 | 38.2% | 59.4% | 2.4% | 1972 |
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 Kittitas 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 Kittitas County, both outside Washington so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside WA (308 bridges here).
- Rockingham County, NH · 308 bridges
- Surry County, NC · 308 bridges
- Falls County, TX · 308 bridges
- Mississippi County, AR · 309 bridges
Similar average build year
Nearest mean year-built outside WA (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.
Good-condition bridges (120)
NO DATA ENTERED
GoodOver: PILEUP CREEK
NO DATA ENTERED, Kittitas, WA
Built 2012 Load: 54.8 t ADT: 120
I-90 WB
GoodOver: UNNAMED CREEK
6.2 E JCT SR 906, Kittitas, WA
Built 2016 Load: 55.1 t ADT: 17,475
NELSON SIDING ROAD
GoodOver: BIG CREEK
01.45 SE of I-90, Kittitas, WA
Built 2012 Load: 56.1 t ADT: 800
Vantage Hwy
GoodOver: Cascade Canal
MP 5.25 Vantage Hwy, Kittitas, WA
Built 2023 Load: 56.1 t ADT: 3,979
I-90 EB
GoodOver: UNNAMED CREEK
6.2 E JCT SR 906, Kittitas, WA
Built 2017 Load: 57.0 t ADT: 17,475
I-90
GoodOver: ANIMAL CROSSING
0.6 E JCT SR 906, Kittitas, WA
Built 2010 Load: 57.1 t ADT: 17,475
I-90
GoodOver: ROCKY RUN CREEK
2.1 E JCT SR 906, Kittitas, WA
Built 2011 Load: 58.0 t ADT: 17,475
ROAD
GoodOver: CLE ELUM RIVER
NEAR CAMPGROUND ENTRANCE, Kittitas, WA
Built 2008 Load: 59.9 t ADT: 99
ROAD
GoodOver: LOG CREEK
NO DATA ENTERED, Kittitas, WA
Built 1978 Load: 60.9 t ADT: 50
I-90
GoodOver: WEST SIDE CANAL
14.7 E JCT SR 970, Kittitas, WA
Built 1966 Load: 63.5 t ADT: 14,344
PARK RD HYAK DORM
GoodOver: COAL CREEK
HYAK MAINTENANCE, Kittitas, WA
Built 1996 Load: 68.0 t ADT: 58
US 97
GoodOver: SWAUK CREEK
4.1 N JCT SR 970, Kittitas, WA
Built 1994 Load: 89.8 t ADT: 6,032
US 97
GoodOver: SWAUK CREEK
4.6 N JCT SR 970, Kittitas, WA
Built 1994 Load: 89.8 t ADT: 6,032
US 97
GoodOver: SWAUK CREEK
5.6 N JCT SR 970, Kittitas, WA
Built 1994 Load: 89.8 t ADT: 6,032
US 97
GoodOver: SWAUK CREEK
6.7 N JCT SR 970, Kittitas, WA
Built 1994 Load: 89.8 t ADT: 6,032
I-90
GoodOver: NANEUM CR
1.2 E JCT I-82, Kittitas, WA
Built 1970 Load: 89.8 t ADT: 17,603
I-90
GoodOver: COLEMAN CR
1.7 E JCT I-82, Kittitas, WA
Built 1970 Load: 89.8 t ADT: 17,603
I-90
GoodOver: COOKE CREEK
3.2 E JCT I-82, Kittitas, WA
Built 1970 Load: 89.8 t ADT: 17,603
I-82
GoodOver: COLEMAN CREEK
3.0 E JCT I-90, Kittitas, WA
Built 1969 Load: 89.8 t ADT: 18,975
US 97
GoodOver: CASCADE CANAL
1.8 N JCT SR 10, Kittitas, WA
Built 1900 Load: 96.9 t ADT: 2,686
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.