Mercer County, IL

162 public highway bridges

Mercer County Bridge Snapshot

Mercer County, Illinois contains 162 public highway bridges in the FHWA National Bridge Inventory. Roughly 51.2% are rated “Good,” 42% “Fair,” 6.8% “Poor,” and 6.8% 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 IL 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.

162

Total Bridges

51.2%

Good

6.8%

Poor

6.8%

Structurally Deficient

Condition Distribution

Good

51.2% (83)

Fair

42% (68)

Poor

6.8% (11)

SD

6.8% (11)

All Bridges (162)

Sort:

TR 42

Over: POPE CREEK

N EDGE OF KEITHSBURG, Mercer, IL

Built 1990 Load: 32.4 t ADT: 10

TR 284

Over: BRANCH OF POPE CREEK

NW-36-T14NR1W, Mercer, IL

Built 1981 Load: 32.4 t ADT: 25

TR 268

Over: POPE CR

S.CTR-21-T14NR1W, Mercer, IL

Built 1987 Load: 32.4 t ADT: 100

TR 107

Over: STREAM

N.CTR-2-T14NR1W, Mercer, IL

Built 1988 Load: 32.4 t ADT: 25

TR 240

Over: DONAHUE RUN

NW-7-T14NR1W, Mercer, IL

Built 1991 Load: 32.4 t ADT: 50

TR 260

Over: N. POPE CREEK

CTR-20-T14NR1W, Mercer, IL

Built 1992 Load: 32.4 t ADT: 75

TR 252

Over: DONOHUE RUN

NW COR-8-T14NR1W, Mercer, IL

Built 1996 Load: 32.4 t ADT: 25

TR 266

Over: TRIB TO EDWARDS RIV

WLINE NW1/4 T14NR1W, Mercer, IL

Built 1998 Load: 32.4 t ADT: 25

TR 274

Over: POPE CREEK

E.CTR-21-T14NR1W, Mercer, IL

Built 2006 Load: 32.4 t ADT: 25

TR 183A

Over: STREAM

CTR-28-T14NR2W, Mercer, IL

Built 1992 Load: 32.4 t ADT: 25

TR 198A

Over: EDWARDS RIVER

NW-6-T14NR2W, Mercer, IL

Built 1998 Load: 32.4 t ADT: 25

TR 230

Over: DONAHUE RUN

SE-2-T14NR2W, Mercer, IL

Built 2009 Load: 32.4 t ADT: 25

TR 136B

Over: PIKE RUN CREEK

E.CTR-30-T14NR3W, Mercer, IL

Built 1984 Load: 32.4 t ADT: 175

TR 158

Over: PIKE RUN

W.CTR-28-T14NR3W, Mercer, IL

Built 1992 Load: 32.4 t ADT: 325

TR 132

Over: EDWARDS RIVER

NE-7-T14NR3W, Mercer, IL

Built 2007 Load: 32.4 t ADT: 50

TR 193A

Over: WILDCAT CREEK

CTR-33-T14NR4W, Mercer, IL

Built 1984 Load: 32.4 t ADT: 25

TR 100A

Over: WILDCAT CREEK

SE-28-T14NR4W, Mercer, IL

Built 1991 Load: 32.4 t ADT: 25

TR 52

Over: EDWARDS RIVER

SE-2-T14NR5W, Mercer, IL

Built 1990 Load: 32.4 t ADT: 25

TR 109

Over: ELIZA CREEK

SE-1-T14NR6W, Mercer, IL

Built 1994 Load: 32.4 t ADT: 50

TR 111

Over: WINTERS CREEK

W.CTR-3-T14NR5W, Mercer, IL

Built 1997 Load: 32.4 t ADT: 25

TR 2

Over: CAMP CREEK

SE-12-T15NR1W, Mercer, IL

Built 1980 Load: 32.4 t ADT: 50

TR 262

Over: EDWARDS RIVER

SE-29-T15NR1W, Mercer, IL

Built 2005 Load: 32.4 t ADT: 50

TR 97

Over: TRIB TO EDWARDS RIV

SW1/4-32-T15NR2W, Mercer, IL

Built 2002 Load: 32.4 t ADT: 25

TR 208

Over: CAMP CREEK

SE1/4NE1/4-20-T15NR2, Mercer, IL

Built 2006 Load: 32.4 t ADT: 25

TR 176

Over: CAMP CREEK

SW-23-T15NR3W, Mercer, IL

Built 1980 Load: 32.4 t ADT: 25

TR 40

Over: ELIZA CREEK

NE-22-T15NR5W, Mercer, IL

Built 1988 Load: 32.4 t ADT: 25

TR 58

Over: ELIZA CREEK

W.CTR-23-T15NR5W, Mercer, IL

Built 1982 Load: 32.4 t ADT: 25

TR 59

Over: MAIN DITCH

S.CTR-23-T15NR6W, Mercer, IL

Built 1986 Load: 32.4 t ADT: 75

TR 40

Over: WINTER'S CREEK

SE-34-T15NR5W, Mercer, IL

Built 1991 Load: 32.4 t ADT: 25

TR 3

Over: MAIN DITCH NORTH

SW-1-T15NR6W, Mercer, IL

Built 2001 Load: 32.4 t ADT: 75

TR 8

Over: MAIN DITCH NORTH

SW-24-T15NR6W, Mercer, IL

Built 2007 Load: 32.4 t ADT: 10

TR 228

Over: N. POPE CREEK

Sec 24,T14N,R2W, Mercer, IL

Built 2020 Load: 32.4 t ADT: 25

FAS 214

Over: SNAKE CREEK

SW COR-24-T13NR4W, Mercer, IL

Built 1990 Load: 32.4 t ADT: 50

TR 95

Over: TRIB EDWARDS RIVER

SE-36-T15NR3W, Mercer, IL

Built 1999 Load: 32.7 t ADT: 25

TR 206

Over: NORTH HENDERSON CR

SW-21-T13NR2W, Mercer, IL

Built 1996 Load: 34.7 t ADT: 50

TR 264

Over: CAMP CREEK

E.CTR-20-T15NR1W, Mercer, IL

Built 2019 Load: 35.0 t ADT: 125

TR 205

Over: PIKE RUN

NE-1-T13NR4W, Mercer, IL

Built 1980 Load: 37.6 t ADT: 50

TR 290B

Over: POPE CREEK

N CTR-14-T14NR1W, Mercer, IL

Built 1998 Load: 37.9 t ADT: 25

TR 69

Over: CAMP CREEK

NE-29-T15NR1W, Mercer, IL

Built 1980 Load: 38.6 t ADT: 100

TR 59

Over: DRAINAGE DITCH

SW-24-T15NR6W, Mercer, IL

Built 1995 Load: 38.6 t ADT: 75

TR 97

Over: TRIB EDWARDS RIVER

SE1/4 SEC32 T15NR2W, Mercer, IL

Built 2000 Load: 38.9 t ADT: 25

TR 164

Over: CAMP CREEK

SW-21-T15NR3W, Mercer, IL

Built 1998 Load: 39.9 t ADT: 25

FAS 212 (CH 9)

Over: CAMP CREEK

NW-8-T14NR4W, Mercer, IL

Built 2018 Load: 41.8 t ADT: 300

TR 133

Over: TRIB TO PARKER RUN

SW-2-T14NR1W, Mercer, IL

Built 1998 Load: 42.1 t ADT: 50

TR 206

Over: POPE CREEK

SW-33-T14NR2W, Mercer, IL

Built 1984 Load: 42.1 t ADT: 25

TR 244

Over: POPE CREEK

SW-31-T14NR1W, Mercer, IL

Built 1983 Load: 43.7 t ADT: 25

TR 45

Over: N. CAMP CREEK

NE-23-T15NR3W, Mercer, IL

Built 2020 Load: 47.6 t ADT: 10

TR 124

Over: POPE CREEK

SE-1-T13NR4W, Mercer, IL

Built 1982 Load: 48.0 t ADT: 25

TR 192

Over: MAIDS RUN

SE-12-T13NR3W, Mercer, IL

Built 2021 Load: 56.1 t ADT: 10

TR 33

Over: BURNT BRANCH

NE-16-T15NR5W, Mercer, IL

Built 1984 Load: 63.5 t ADT: 50

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

Reviewed byPlainbridges Editorial, Plain Bridges Editorial Team · June 6, 2026