Total bridges
218
Public highway bridges in Clark County
County profile · official public datasets
Clark County, WA
218 public highway bridges tracked in the FHWA National Bridge Inventory: 55% rated Good, 40.8% Fair, 4.1% Poor.
- 218
- Public bridges
- 55%
- Good condition
- 4.1%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Clark County posts a better-than-median Poor-condition share among rated counties in the state across mid-size county bridge inventory.
- Top 33%
- lowest Poor share in state
- 4.1%
- Poor-condition share
- 218
- public highway bridges
- 1979
- 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.
Clark County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Clark County ranks #13 of 39 Washington counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 4.1%). Clark County, Washington contains 218 public highway bridges. Roughly 55% are rated “Good,” 40.8% “Fair,” and 4.1% “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
55%
120 of 218 rated 7-9
Fair condition
40.8%
89 of 218 rated 5-6
Poor condition
4.1%
9 of 218 rated 4 or below
In-state Poor-share rank
#13 of 39
Among Washington counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 218 NBI-tracked bridges by lowest applicable component rating.
Good 55% (120)
Fair 40.8% (89)
Poor 4.1% (9)
Clark County's Poor-condition bridges carry 116,811 vehicle crossings a day
That is 3.5% of the county's reported daily bridge traffic on 4.1% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 12,979 crossings a day against 12,667 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 218 of 218 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
47.7% of Clark County's bridges have passed the 50-year mark
104 of the 218 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 55% 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 35.4% of the county's Poor-condition bridge traffic
I-5 over E FORK LEWIS RIVER, built 1939, carries 41,367 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 9-bridge count understates how much of the daily burden sits on a single crossing.
Share is of the 116,811 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When Clark County's bridges were built
218 bridges with a recorded construction year, grouped by decade
- 1910s 3
1910–1919
3 bridges
- 1920s 2
1920–1929
2 bridges
- 1930s 11
1930–1939
11 bridges
- 1940s 9
1940–1949
9 bridges
- 1950s
1950–1959
19 bridges
- 1960s
1960–1969
31 bridges
- 1970s
1970–1979
41 bridges
- 1980s
1980–1989
27 bridges
- 1990s
1990–1999
17 bridges
- 2000s
2000–2009
29 bridges
- 2010s
2010–2019
26 bridges
- 2020s 3
2020–2029
3 bridges
What this shows Construction peaked in the 1970s, when 41 of the county's bridges still in the inventory were built, which is 18.8% of those with a recorded year. That cohort is now 45 to 54 years old in the 2024 inventory. Its average build year (1979) matches the Washington average (1975).
How Clark County compares with Washington's closest counties by inventory size
The 5 Washington counties nearest Clark County in number of bridges, with their condition splits. Its 4.1% Poor share is the 3rd-lowest of these 6. Its average build year of 1979 against a peer-group mean of 1971 is 8 years newer.
Showing the 5 closest of 38 Washington counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Skagit County | 254 | 38.2% | 59.4% | 2.4% | 1972 |
| Clark County (this page) | 218 | 55% | 40.8% | 4.1% | 1979 |
| Thurston County | 205 | 59.5% | 39.5% | 1% | 1979 |
| Walla Walla County | 195 | 64.1% | 27.2% | 8.7% | 1980 |
| Adams County | 187 | 35.3% | 54.5% | 10.2% | 1961 |
| Lincoln County | 180 | 56.7% | 37.2% | 6.1% | 1965 |
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 Clark 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 Clark County, both outside Washington so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside WA (218 bridges here).
- Okaloosa County, FL · 218 bridges
- Yellow Medicine County, MN · 218 bridges
- Fillmore County, NE · 218 bridges
- Newberry County, SC · 218 bridges
Similar average build year
Nearest mean year-built outside WA (1979 here).
- Pima County, AZ · avg 1979 · 1,150 bridges
- Jefferson County, KY · avg 1979 · 662 bridges
- Spartanburg County, SC · avg 1979 · 638 bridges
- McPherson County, KS · avg 1979 · 586 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
All bridges (218)
SR 14
GoodOver: E-6TH RAMP
6.3 E JCT I-205, Clark, WA
Built 1965 Load: 89.8 t ADT: 28,335
S-E RAMP FROM I-5
GoodOver: SR 14
0.3 N OREGON, Clark, WA
Built 1983 Load: 89.8 t ADT: 13,957
S-E RAMP
GoodOver: I-5
0.3 N OREGON, Clark, WA
Built 1983 Load: 89.8 t ADT: 13,957
SR 501
GoodOver: FLUSHING CHANNEL
5.3 N JCT I-5, Clark, WA
Built 1990 Load: 89.8 t ADT: 950
NE Woodburn Drive
GoodOver: Tributary to Lacamas Ck
.25 miles west of 283rd, Clark, WA
Built 2013 Load: 95.9 t ADT: 200
NE Ward Road
GoodOver: NE 172nd Ave
0.1 miled east of 172nd A, Clark, WA
Built 2009 Load: 96.9 t ADT: 10,460
NW Carty Road
GoodOver: Gee Creek
1.13 W of NE 10th Ave, Clark, WA
Built 2016 Load: 96.9 t ADT: 1,097
NE MANLEY ROAD
GoodOver: MANLEY CREEK
NE 249TH ST & NE 254TH ST, Clark, WA
Built 2020 Load: 96.9 t ADT: 1,961
NE 92ND AVE
GoodOver: MANLEY CREEK
NE 244TH ST & NE 249TH ST, Clark, WA
Built 2021 Load: 96.9 t ADT: 600
LIESER RD
PoorOver: SR 14
4.4 E JCT I-5, Clark, WA
Built 1969 Load: 13.3 t ADT: 8,560
SR 500
PoorOver: HJF CANAL
13.8 E JCT SR 503, Clark, WA
Built 1915 Load: 14.5 t ADT: 7,340
CC LANDON ROAD
PoorOver: YACOLT CREEK
0.3 W CO RD 16, Clark, WA
Built 1955 Load: 16.5 t ADT: 312
I-5
PoorOver: LEWIS RIVER
5.8 N JCT SR 501, Clark, WA
Built 1940 Load: 18.1 t ADT: 41,367
I-5
PoorOver: E FORK LEWIS RIVER
4.1 N JCT SR 501, Clark, WA
Built 1939 Load: 19.0 t ADT: 41,367
NO DATA ENTERED
PoorOver: CANYON CREEK
ABOUT 4 MILES EAST OF CHE, Clark, WA
Built 1948 Load: 24.2 t ADT: 207
SR 500
PoorOver: LACAMAS LAKE
12.6 E JCT SR 503, Clark, WA
Built 1930 Load: 25.3 t ADT: 10,894
SR 503
PoorOver: N BRANCH CHELATCHIE CR
13.5 N JCT SR 502, Clark, WA
Built 1953 Load: 31.7 t ADT: 818
SR 14
PoorOver: BN RR
4.1 E JCT SR 500, Clark, WA
Built 1972 Load: 52.6 t ADT: 5,946
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.