Mercer County, PA

273 public highway bridges

Mercer County Bridge Snapshot

Mercer County, Pennsylvania contains 273 public highway bridges in the FHWA National Bridge Inventory. Roughly 42.1% are rated “Good,” 30.4% “Fair,” 13.6% “Poor,” and 13.6% are classified as structurally deficient — the federal designation for spans whose deck, superstructure, or substructure has been rated 4 or below on the 0–9 NBI scale. Structurally deficient does not mean unsafe to cross; it means the bridge is on the priority list for repair or replacement.

Inspections in PA are conducted by certified engineers from the state Department of Transportation on a 24-month cycle, and results are reported back to the FHWA each spring. The list below shows every NBI-tracked bridge in the county, sorted by inventory load rating. Use the “Sort by” controls to surface the lowest-rated spans first, and click any row for full inspection history, traffic counts, and condition trends.

Source: FHWA National Bridge Inventory. See methodology for full definitions.

273
Total Bridges
42.1%
Good
13.6%
Poor
13.6%
Structurally Deficient

Condition Distribution

Good
42.1% (115)
Fair
30.4% (83)
Poor
13.6% (37)
SD
13.6% (37)

All Bridges (273)

SR 173, LIBERTY ST

Good

Over: SWAMP RUN

PINE TWP, Mercer, PA

Built 2014 Load: 36.3 t ADT: 4,168

BRIDGE 651, T-860

Good

Over: POWDERMILL RUN

FRENCH CREEK TWP, Mercer, PA

Built 2012 Load: 36.9 t ADT: 850

BR 1704

Good

Over: SANDY LAKE OUTLET

WALNUT ST SANDY LAKE, Mercer, PA

Built 2017 Load: 36.9 t ADT: 223

SR 258,BUTLER PIKE

Good

Over: OVER NESHANNOCK CREEK

FINDLEY TOWNSHIP, Mercer, PA

Built 1998 Load: 37.2 t ADT: 2,720

BRIDGE 499,T-907

Good

Over: OVER SANDY CREEK

COUNTY LINE, SANDY CREEK, Mercer, PA

Built 1999 Load: 37.2 t ADT: 188

SR 158, Mercer Rd.

Good

Over: LITTLE NESHANNOCK CREEK

WILMINGTON TOWNSHIP, Mercer, PA

Built 2010 Load: 37.2 t ADT: 2,427

SR 60,BROADWAY AVE

Good

Over: BOBBY RUN

CITY OF HERMITAGE, Mercer, PA

Built 1950 Load: 37.3 t ADT: 7,590

BRIDGE 2809,T-955

Good

Over: OVER TURKEY RUN

OAK HILL RD.,SHENANGO TWP, Mercer, PA

Built 2016 Load: 37.3 t ADT: 97

SR 173, Grove City

Good

Over: WOLF CREEK BRANCH

WORTH TWP, Mercer, PA

Built 2010 Load: 37.9 t ADT: 1,543

BRIDGE 1112,T-695

Good

Over: OVER LITTLE SHENANGO BR.

SHELL ROAD,NEW VERNON TWP, Mercer, PA

Built 1994 Load: 38.1 t ADT: 56

SR 208,NORTH ST.

Good

Over: OVER WOLF CREEK

GROVE CITY BOROUGH, Mercer, PA

Built 2004 Load: 38.1 t ADT: 3,022

SR 62 EXPRESSWAY

Good

Over: OVER NS RAILROAD

CITY OF SHARON, Mercer, PA

Built 2010 Load: 38.1 t ADT: 9,562

SR 4024,BAKER HILL

Good

Over: LAWANGO CREEK

DELAWARE TOWNSHIP, Mercer, PA

Built 2010 Load: 38.1 t ADT: 226

SR 19

Good

Over: NESHANNOCK CREEK

SPRINGFIELD TWP., Mercer, PA

Built 2013 Load: 38.9 t ADT: 2,520

SR 18,COLLEGE AVE.

Good

Over: OVER LITTLE SHENANGO R

GREENVILLE BOROUGH, Mercer, PA

Built 1986 Load: 39.0 t ADT: 5,803

SR 4006, PORTER RD

Good

Over: LITTLE SHENANGO RIVER

WEST SALEM TOWNSHIP, Mercer, PA

Built 2005 Load: 39.0 t ADT: 1,277

WILLIAMSON ROAD

Good

Over: OVER LT.SHENANGO RIVER

HEMPFIELD TOWNSHIP, Mercer, PA

Built 2006 Load: 39.0 t ADT: 2,248

SR 58, MERCER ROAD

Good

Over: MOURY RUN

HEMPFIELD TWP, Mercer, PA

Built 2013 Load: 39.5 t ADT: 5,150

BUTLER PIKE

Good

Over: BLACK RUN

LIBERTY TOWNSHIP, Mercer, PA

Built 2010 Load: 39.9 t ADT: 2,373

SR 4021, Atlantic

Good

Over: OVER HOLLOW RUN

SUGAR GROVE TWP, Mercer, PA

Built 2010 Load: 39.9 t ADT: 520

BRIDGE 1416, T-634

Good

Over: OTTER CREEK

REDFOOT RD, DEAWARE TWP, Mercer, PA

Built 2015 Load: 40.2 t ADT: 43

SR 173,GROVE CITY

Good

Over: TRIB TO WOLF CREEK

WORTH TWP, Mercer, PA

Built 2013 Load: 40.5 t ADT: 1,873

SR 62, MAIN STREET

Good

Over: OVER SANDY CREEK

SANDY LAKE BOROUGH, Mercer, PA

Built 1991 Load: 40.8 t ADT: 1,469

SR 846,RIVER ROAD

Good

Over: OVER MCCULLOUGH RUN

CITY OF HERMITAGE, Mercer, PA

Built 1997 Load: 40.8 t ADT: 1,822

BRIDGE 1915,T-549

Good

Over: OVER MAGARGEE RUN

CLAY FURNACE,JEFFERSON, Mercer, PA

Built 1973 Load: 40.8 t ADT: 85

SR 518,LONGVIEW RD

Good

Over: OVER BOBBY RUN

CITY OF HERMITAGE, Mercer, PA

Built 1997 Load: 40.8 t ADT: 5,955

SR 4017,WARNER RD

Good

Over: OVER B.&L.E. RAILROAD

SUGAR GROVE TOWNSHIP, Mercer, PA

Built 1997 Load: 40.8 t ADT: 1,428

SR 18,MAIN STREET

Good

Over: OVER SHENANGO RIVER

GREENVILLE BOROUGH, Mercer, PA

Built 1997 Load: 40.8 t ADT: 10,714

SR 3018,BUCKEYE DR

Good

Over: OVER MCCULLOUGH RUN

SOUTH PYMATUNING TOWNSHIP, Mercer, PA

Built 1999 Load: 40.8 t ADT: 2,356

BRIDGE 2629,T-944

Good

Over: OVER PINE RUN

UBER ROAD,FINDLEY TWP., Mercer, PA

Built 2000 Load: 40.8 t ADT: 38

BRIDGE 2709,T-912

Good

Over: OVER WOLF CREEK E.BRANCH

PATTERSON SCHL.,WOLF CK., Mercer, PA

Built 2001 Load: 40.8 t ADT: 67

BUTLER PIKE

Good

Over: PINE RUN

FINDLEY TOWNSHIP, Mercer, PA

Built 2009 Load: 40.8 t ADT: 2,720

KINSMEN ROAD

Good

Over: BR. SUGAR CREEK

GREENE TOWNSHIP, Mercer, PA

Built 2009 Load: 40.8 t ADT: 1,159

SR 258, LAKE ROAD

Good

Over: OVER LACAWANNOCK CREEK

JEFFERSON TOWNSHIP, Mercer, PA

Built 1997 Load: 41.7 t ADT: 931

BRIDGE 1917,T-496

Good

Over: OVER MAGARGEE RUN

CLAYFURNACE RD JEFFERSON, Mercer, PA

Built 2002 Load: 41.7 t ADT: 155

BRIDGE 2630,T-403

Good

Over: OVER PINE RUN

MCCLELLAND RD.,FINDLEY, Mercer, PA

Built 1988 Load: 42.6 t ADT: 182

BRIDGE 607,T-846

Good

Over: OVER NORTH DEER CREEK

BRANCH RD.,FRENCH CREEK, Mercer, PA

Built 1990 Load: 42.6 t ADT: 31

SR 62,FRANKLIN RD.

Good

Over: OVER OTTER CREEK

COOLSPRINGS TOWNSHIP, Mercer, PA

Built 1997 Load: 42.6 t ADT: 3,515

SR 58,KINSMAN ROAD

Good

Over: OVER SUGAR CREEK

GREEN TOWNSHIP, Mercer, PA

Built 2001 Load: 42.6 t ADT: 1,267

BRIDGE 2324,T-307

Good

Over: OVER BOBBY RUN

LYNNWOOD RD.,HERMITAGE, Mercer, PA

Built 2003 Load: 42.6 t ADT: 1,423

SANDY LAKE ROAD

Good

Over: DEER CREEK

FRENCH CREEK TWP, Mercer, PA

Built 2009 Load: 42.6 t ADT: 1,489

SR 80,EB

Good

Over: OVER ABND'N.RR/NESHNK.CK

FINDLEY TOWNSHIP, Mercer, PA

Built 1998 Load: 43.5 t ADT: 12,524

SR2005IRISHTOWN RD

Good

Over: OVER B.&L.E. R.R.

PINE TOWNSHIP, Mercer, PA

Built 2015 Load: 45.0 t ADT: 1,800

SR 80,EB

Good

Over: OVER WOLF CREEK

WOLF CREEK TOWNSHIP, Mercer, PA

Built 1965 Load: 45.4 t ADT: 10,833

SR 3008,E.STATE ST

Good

Over: OVER SHENANGO RIVER TRIB

CITY OF HERMITAGE, Mercer, PA

Built 1996 Load: 45.4 t ADT: 10,858

BRIDGE 1905,T-584

Good

Over: OVER LACKAWANNOCK CREEK

N.BEND RD,JEFFERSON TWP., Mercer, PA

Built 1965 Load: 45.4 t ADT: 94

BRIDGE 1215,T-918

Good

Over: OVER LITTLE SANDY CREEK

DEEMERS DAM RD.,MILL CK., Mercer, PA

Built 1997 Load: 45.4 t ADT: 27

BRIDGE 813,T-470

Good

Over: OVER SHENANGO RIVER BR

HAMBURG RD HEMPFIELD TWP, Mercer, PA

Built 2003 Load: 45.4 t ADT: 3,134

BRIDGE 613,T-859

Good

Over: OVER NORTH DEER CREEK

CREEK RD.,FRENCH CREEK TP, Mercer, PA

Built 1965 Load: 46.0 t ADT: 97

BRIDGE 2811

Good

Over: LITTLE DEER CK

RIGGS RD.,SHENANGO TWP., Mercer, PA

Built 2007 Load: 46.3 t ADT: 233

Read our methodology — how this data is sourced, computed, and verified.

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Data sourced from official U.S. government datasets. See our methodology for details. Retrieved and formatted by PlainBridges Editorial