Total bridges
174
Public highway bridges in Mercer County
County profile · official public datasets
Mercer County, WV
174 public highway bridges tracked in the FHWA National Bridge Inventory: 2.3% rated Good, 72.4% Fair, 25.3% Poor.
- 174
- Public bridges
- 2.3%
- Good condition
- 25.3%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Mercer County posts a higher-than-median Poor-condition share among rated counties in the state across mid-size county bridge inventory.
- 45th
- of 55 on Poor share
- 25.3%
- Poor-condition share
- 174
- 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.
Mercer County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Mercer County ranks #45 of 55 West Virginia counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 25.3%). Mercer County, West Virginia contains 174 public highway bridges. Roughly 2.3% are rated “Good,” 72.4% “Fair,” and 25.3% “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
2.3%
4 of 174 rated 7-9
Fair condition
72.4%
126 of 174 rated 5-6
Poor condition
25.3%
44 of 174 rated 4 or below
In-state Poor-share rank
#45 of 55
Among West Virginia counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 174 NBI-tracked bridges by lowest applicable component rating.
Good 2.3% (4)
Fair 72.4% (126)
Poor 25.3% (44)
Mercer County's Poor-condition bridges carry 87,210 vehicle crossings a day
That is 12.3% of the county's reported daily bridge traffic on 25.7% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 1,982 crossings a day against 5,249 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 171 of 174 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
35.6% of Mercer County's bridges have passed the 50-year mark
62 of the 174 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 2.3% 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 21.6% of the county's Poor-condition bridge traffic
US 19 over BRUSH CREEK, built 1977, carries 18,800 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 44-bridge count understates how much of the daily burden sits on a single crossing.
Share is of the 87,210 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When Mercer County's bridges were built
174 bridges with a recorded construction year, grouped by decade
- 1920s 2
1920–1929
2 bridges
- 1930s
1930–1939
17 bridges
- 1940s
1940–1949
14 bridges
- 1950s 12
1950–1959
12 bridges
- 1960s 10
1960–1969
10 bridges
- 1970s
1970–1979
34 bridges
- 1980s
1980–1989
17 bridges
- 1990s
1990–1999
34 bridges
- 2000s
2000–2009
22 bridges
- 2010s 9
2010–2019
9 bridges
- 2020s 3
2020–2029
3 bridges
What this shows Construction peaked in the 1970s, when 34 of the county's bridges still in the inventory were built, which is 19.5% of those with a recorded year. That cohort is now 45 to 54 years old in the 2024 inventory. Its average build year (1977) matches the West Virginia average (1980).
How Mercer County compares with West Virginia's closest counties by inventory size
The 5 West Virginia counties nearest Mercer County in number of bridges, with their condition splits. Its 25.3% Poor share is the 5th-lowest of these 6. Its average build year of 1977 against a peer-group mean of 1982 is 5 years older.
Showing the 5 closest of 54 West Virginia counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Preston County | 182 | 35.2% | 41.8% | 23.1% | 1971 |
| Wood County | 180 | 42.2% | 35.6% | 22.2% | 1980 |
| Mercer County (this page) | 174 | 2.3% | 72.4% | 25.3% | 1977 |
| Mingo County | 165 | 29.1% | 55.8% | 15.2% | 1992 |
| Wayne County | 163 | 20.9% | 60.7% | 18.4% | 1982 |
| Wyoming County | 160 | 3.1% | 63.8% | 33.1% | 1985 |
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 Mercer 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 Mercer County, both outside West Virginia so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside WV (174 bridges here).
- Hempstead County, AR · 174 bridges
- Eagle County, CO · 174 bridges
- Washington County, IN · 174 bridges
- Lac qui Parle County, MN · 174 bridges
Similar average build year
Nearest mean year-built outside WV (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.
All bridges (174)
INTERSTATE 77 NB
FairOver: I-77 NB
1.85 MI. N. OF WV 112, Mercer, WV
Built 1969 Load: 14.5 t ADT: 10,450
CR 38/3
FairOver: EAST RIVER
0.01 MI S OF WV 112, Mercer, WV
Built 1979 Load: 18.1 t ADT: 90
COUNTY ROUTE 38/1
FairOver: EAST RIVER
0.22 MILES S OF WV 112, Mercer, WV
Built 2000 Load: 19.0 t ADT: 10
WV 20
FairOver: LAUREL CREEK
0.04 MI S OF CR 44/8, Mercer, WV
Built 1936 Load: 21.8 t ADT: 3,400
COUNTY ROUTE 219/5
FairOver: DAVIS FORK
0.06 MI. E. OF WV. 104, Mercer, WV
Built 1930 Load: 21.8 t ADT: 2,000
CR 35
FairOver: FIVEMILE CREEK
0.52 MI E OF US 460, Mercer, WV
Built 1930 Load: 21.8 t ADT: 850
CR 19/33
FairOver: SOUTH FORK
0.06 MI N OF CR 19/24, Mercer, WV
Built 1933 Load: 21.8 t ADT: 4,200
COUNTY ROUTE 19/49
FairOver: BRUSH CREEK
0.03 MI SOUTH OF CO 19/29, Mercer, WV
Built 1936 Load: 21.8 t ADT: 350
WV RT 102
FairOver: BIG SPRING CREEK
0.02 MI W OF CR 82/2, Mercer, WV
Built 1945 Load: 24.5 t ADT: 850
CR 104/3
FairOver: DAVES FORK
0.05 MI E OF WV 104, Mercer, WV
Built 1978 Load: 24.5 t ADT: 30
COUNTY ROUTE 3
FairOver: BLUESTONE RIVER
0.17 MILE E OF CO 3/2, Mercer, WV
Built 2008 Load: 24.5 t ADT: 150
CR 44/10
FairOver: I 77
0.11 MI S OF CR 14, Mercer, WV
Built 1950 Load: 27.2 t ADT: 650
US 52
FairOver: US 460
0.31 MILE E OF US 460, Mercer, WV
Built 2002 Load: 27.2 t ADT: 7,000
COUNTY RT 30
FairOver: EAST RIVER
0.14 MI. NORTH OF CR 30/1, Mercer, WV
Built 1936 Load: 28.1 t ADT: 50
COUNTY ROUTE 10/30
FairOver: RIGHT HAND FORK
0.01 MI WEST OF WV 10, Mercer, WV
Built 1936 Load: 28.1 t ADT: 30
US 52
FairOver: US 52 and US 460
0.31 MILE E OF US 460, Mercer, WV
Built 2002 Load: 28.1 t
County Rt. 20/20
FairOver: Bluestone River
0.12 Mile S. of Co.120, Mercer, WV
Built 2016 Load: 28.1 t ADT: 40
US 19
FairOver: BLACKLICK CREEK
0.04 MI S OF CR 19/17, Mercer, WV
Built 1930 Load: 29.0 t ADT: 3,900
US 19
FairOver: GRASSY BRANCH
0.72 MI S OF CR 7, Mercer, WV
Built 1930 Load: 29.0 t ADT: 1,700
CR 24/1
FairOver: I 77 South Bound
0.32 MI W OF CR 24, Mercer, WV
Built 1950 Load: 29.0 t ADT: 250
US 52
FairOver: SIMMONS CREEK
1.45 MI E OF C0 52/1, Mercer, WV
Built 1930 Load: 29.0 t ADT: 3,700
US RT 52
FairOver: SIMMONS CREEK
0.01 MI E OF CO 62/51, Mercer, WV
Built 1940 Load: 29.0 t ADT: 3,700
I-77 SOUTHBOUND
FairOver: I-77 Ramp H
1.81 MI N OF WV 112, Mercer, WV
Built 1967 Load: 29.0 t ADT: 10,450
Co. Rt. 102/1
FairOver: Laurel Fork
0.28 mi. w. of WV 102, Mercer, WV
Built 2015 Load: 29.0 t ADT: 20
CR 9
FairOver: LAUREL CREEK
0.03 MI W OF CR 18, Mercer, WV
Built 1979 Load: 29.9 t ADT: 450
CR. 19/19
FairOver: SOUTH FORK
0.01 MI. E. OF CR. 19/33, Mercer, WV
Built 1937 Load: 29.9 t ADT: 50
COUNTY ROUTE 19/45
FairOver: SOUTH FORK
0.01 MI. S. OF CR. 19/33, Mercer, WV
Built 1980 Load: 29.9 t ADT: 80
CR 71/13
FairOver: SANDLICK CREEK
0.31 MI S OF WV 71, Mercer, WV
Built 1983 Load: 29.9 t ADT: 500
US 52
FairOver: US 19 WV 112 CR 25 N&SRR
1.44 MI NORTH OF CO 29, Mercer, WV
Built 2009 Load: 29.9 t
Harp Route 982
FairOver: Camp Creek
0.01 Mi. S Of Co. 19/5, Mercer, WV
Built 2001 Load: 31.7 t ADT: 30
CO 20/5
FairOver: Bluestone River
0.07 miles East of CR.120, Mercer, WV
Built 2016 Load: 31.7 t ADT: 700
CR 7/4
FairOver: BRUSH CREEK
0.03 MI N OF CR 7, Mercer, WV
Built 1968 Load: 32.7 t ADT: 90
COUNTY ROUTE 24/1
FairOver: I 77 North
0.28 MI WEST OF CO 24, Mercer, WV
Built 1977 Load: 32.7 t ADT: 250
CR. 19/33
FairOver: BRUSH CREEK
0.08 MI. S. OF CR. 19/29, Mercer, WV
Built 1978 Load: 32.7 t ADT: 6,200
US. 19 &US. 460
FairOver: SOUTH FORK
0.01 MI. S. OF WV. 123, Mercer, WV
Built 1977 Load: 32.7 t ADT: 13,300
WV 104
FairOver: Brush Creek
0.23 MI E OF CR 219/21, Mercer, WV
Built 2020 Load: 32.7 t ADT: 17,000
I-77 NB
FairOver: Mercer Co. Route 7
0.0 MI. N OF CR 7 I/C, Mercer, WV
Built 1977 Load: 33.6 t ADT: 1,265
I-77 SB
FairOver: Mercer County Route 7
.00 MI N OF CO RT 7 I/G, Mercer, WV
Built 1977 Load: 33.6 t ADT: 15,016
I-77 NB
FairOver: BRUSH CREEK
.08 MI. N. OF RTE 7, Mercer, WV
Built 1979 Load: 33.6 t ADT: 40,127
US 460
FairOver: I-77
0.17 MILE E OF CO 460/7, Mercer, WV
Built 2007 Load: 33.6 t ADT: 12,400
HARP 902/60
FairOver: Widemouth Creek
0.11 Mile N. of CO. 71/3, Mercer, WV
Built 2002 Load: 34.5 t ADT: 20
WV ROUTE 10
FairOver: WIDEMOUTH CK.&NS RR
0.05 MI. S. OF CR. 10/15, Mercer, WV
Built 1950 Load: 35.4 t ADT: 950
I-77 SB
FairOver: BRUSH CREEK
0.05 MI. N OF CO RT 7, Mercer, WV
Built 1977 Load: 35.4 t ADT: 15,016
I-77 SB
FairOver: Routes 19 and 21
0.01 MI N FROM RT 19, Mercer, WV
Built 1977 Load: 35.4 t ADT: 30,659
I-77 NB
FairOver: Routes 19 and 21
0.01 MI N FROM RT 19, Mercer, WV
Built 1977 Load: 35.4 t ADT: 29,826
COUNTY ROUTE 19/33
FairOver: SOUTH FORK
0.48 MI NORTH OF WV 123, Mercer, WV
Built 2002 Load: 35.4 t ADT: 5,200
COUNTY ROUTE 10/9
FairOver: RIGHTHAND FORK
0.20 MI.N. OF WV. 10, Mercer, WV
Built 1980 Load: 36.3 t ADT: 10
I-77 SB
FairOver: WV 112
0.06 MI N OF WV 112 RAMP, Mercer, WV
Built 1967 Load: 36.3 t ADT: 10,850
I-77 ENTR RAMP NB
FairOver: BRUSH CREEK
0.07 MI. N. OF CO RT 7, Mercer, WV
Built 1977 Load: 36.3 t ADT: 15,016
I-77 NB
FairOver: Mercer County Route 3
2.76 MI S OF US 19, Mercer, WV
Built 1977 Load: 36.3 t ADT: 38,897
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.