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)

ILL 94

Fair

Over: DUCK CREEK

4 MI N OF LITTLEYORK, Mercer, IL

Built 1989 Load: 36.9 t ADT: 1,250

4TH ST

Fair

Over: POPE CREEK

IN KEITHSBURG, Mercer, IL

Built 1989 Load: 36.9 t ADT: 800

FAS 1210-CH 10

Fair

Over: EDWARDS RIVER

NE-9-T14NR5W, Mercer, IL

Built 1980 Load: 37.6 t ADT: 100

TR 208

Fair

Over: EDWARDS RIVER

SE-32-T15NR2W, Mercer, IL

Built 1997 Load: 38.6 t ADT: 75

US 67

Fair

Over: TOMS CREEK

025 MI N ALEXIS WYE, Mercer, IL

Built 1999 Load: 38.9 t ADT: 2,400

ILL 94

Fair

Over: N. HENDERSON CR

2.4 MI N OF ILL 135, Mercer, IL

Built 1924 Load: 40.5 t ADT: 1,250

FAS 212-CH 9

Fair

Over: ELIZA CREEK

NW-17-T15NR4W, Mercer, IL

Built 1973 Load: 40.5 t ADT: 150

US 67

Fair

Over: EDWARDS RIVER

2 MI N OF VIOLA, Mercer, IL

Built 1998 Load: 40.8 t ADT: 5,300

FAS 211-CH 8

Fair

Over: ELIZA CREEK

SE-21-T15NR5W, Mercer, IL

Built 1961 Load: 41.8 t ADT: 100

TR 244

Fair

Over: HENDERSON CREEK

CTR-18-T13NR1W, Mercer, IL

Built 1965 Load: 41.8 t ADT: 25

TR 284

Fair

Over: POPE CREEK

NW-1-T13NR1W, Mercer, IL

Built 1981 Load: 43.7 t ADT: 25

TR 47

Fair

Over: CAMP CREEK

SE-16-T15N,R2W, Mercer, IL

Built 1983 Load: 44.4 t ADT: 25

TR129

Fair

Over: DONOHUE RUN

CTR-3-T14NR2W, Mercer, IL

Built 1974 Load: 45.0 t ADT: 100

FAS 214-CH 13

Fair

Over: CAMP CREEK

SW-34-T15NR4W, Mercer, IL

Built 1973 Load: 46.0 t ADT: 75

US 67

Fair

Over: DONAHUE CREEK

1.6 MI N OF IL 17, Mercer, IL

Built 1997 Load: 51.5 t ADT: 5,300

TR 223

Fair

Over: DOUGLAS CREEK

NE-11-T13NR4W, Mercer, IL

Built 1997 Load: 51.8 t ADT: 10

ILL 94

Fair

Over: EDWARDS RIVER

1.9 MI N OF ILL 17, Mercer, IL

Built 1960 Load: 52.2 t ADT: 3,450

TR 191

Fair

Over: MAD RUN CREEK

E.CTR-35-T14NR5W, Mercer, IL

Built 1985 Load: 56.4 t ADT: 25

TR 165

Good

Over: ELIZA LAKE DITCH

2 Mi N of New Boston, Mercer, IL

Built 2015 Load: 19.4 t ADT: 50

FAS 1216-CH 3

Good

Over: POPE CREEK

NW-31-T14NR2W, Mercer, IL

Built 1962 Load: 24.0 t ADT: 25

FAS 1216-CH 3

Good

Over: MAIDS RUN

NE-7-T13NR2W, Mercer, IL

Built 1968 Load: 24.3 t ADT: 10

TR 244

Good

Over: N. POPE CREEK

SW-19-T14NR1W, Mercer, IL

Built 1972 Load: 24.3 t ADT: 50

TR 188

Good

Over: POPE CREEK

SE-35-T14NR3W, Mercer, IL

Built 1980 Load: 26.6 t ADT: 50

TR 186A

Good

Over: DUCK CREEK

SE-26-T13NR3W, Mercer, IL

Built 1958 Load: 29.2 t ADT: 10

TR 116

Good

Over: DOUGLAS CREEK

S.CTR-25-T14NR4W, Mercer, IL

Built 2003 Load: 29.8 t ADT: 125

TR 50

Good

Over: POPE CREEK

NW-13-T13NR5W, Mercer, IL

Built 1980 Load: 32.1 t ADT: 75

FAS 1405 CH 12

Good

Over: N. HENDERSON BRANCH

SW-14-T13NR1W, Mercer, IL

Built 2016 Load: 32.4 t ADT: 50

FAS 217 (CH 6)

Good

Over: Maids Run

NE-14-T13NR3W, Mercer, IL

Built 2012 Load: 32.4 t ADT: 75

FAS 214-CH 13

Good

Over: POPE CREEK

W.CTR-12-T13NR4W, Mercer, IL

Built 2008 Load: 32.4 t ADT: 200

FAS 1210

Good

Over: STREAM

NE SEC 4 T14N R5W, Mercer, IL

Built 1994 Load: 32.4 t ADT: 100

FAS 209-CH 14

Good

Over: ELIZA CREEK N.

CTR-7-T15NR5W, Mercer, IL

Built 1978 Load: 32.4 t ADT: 1,450

FAS 209(CH 14)

Good

Over: UNNAMED STREAM

1.14 S ROCK ISLANDCO, Mercer, IL

Built 2004 Load: 32.4 t ADT: 1,450

FAS 209-CH 14

Good

Over: KEATING DITCH

SE-7-T15NR5W, Mercer, IL

Built 2008 Load: 32.4 t ADT: 1,450

FAS 215-CH 16

Good

Over: SNAKE CREEK

SE-23-T13NR4W, Mercer, IL

Built 2020 Load: 32.4 t ADT: 300

TR 274

Good

Over: HENDERSON CREEK

E.CTR-16-T13NR1W, Mercer, IL

Built 1984 Load: 32.4 t ADT: 25

TR 196

Good

Over: DUCK CREEK

NW-31-T13NR2W, Mercer, IL

Built 1984 Load: 32.4 t ADT: 25

TR 207

Good

Over: POPE CREEK

NE-2-T13NR2W, Mercer, IL

Built 1988 Load: 32.4 t ADT: 25

TR 196

Good

Over: N. HENDERSON CREEK

SW-19-T13NR2W, Mercer, IL

Built 1986 Load: 32.4 t ADT: 25

TR 210

Good

Over: N. HENDERSON CREEK

SW-22-T13NR2W, Mercer, IL

Built 1992 Load: 32.4 t ADT: 25

TR228

Good

Over: POPE CREEK

NW-1-T-13N RW, Mercer, IL

Built 2015 Load: 32.4 t ADT: 10

TR 120

Good

Over: HENDERSON CREEK

SW-30-T13NR3W, Mercer, IL

Built 1984 Load: 32.4 t ADT: 25

TR 162

Good

Over: POPE CREEK

N.CTR-3-T13NR3W, Mercer, IL

Built 1987 Load: 32.4 t ADT: 25

TR 225

Good

Over: POPE CREEK

W.CTR-4-T13NR3W, Mercer, IL

Built 1991 Load: 32.4 t ADT: 35

TR 225

Good

Over: BR. OF POPE CREEK

W-4-T13NR3W, Mercer, IL

Built 1991 Load: 32.4 t ADT: 35

TR 253

Good

Over: HENDERSON CREEK

CTR-30-T13NR3W, Mercer, IL

Built 1994 Load: 32.4 t ADT: 50

TR 162

Good

Over: DUCK CREEK

NW-35-T13NR3W, Mercer, IL

Built 1997 Load: 32.4 t ADT: 25

TR 162

Good

Over: HENDERSON CREEK

NW-26-T31NR3W, Mercer, IL

Built 2016 Load: 32.4 t ADT: 50

TR 44

Good

Over: POPE CREEK

CTR,NW-8-T13NR4W, Mercer, IL

Built 1977 Load: 32.4 t ADT: 100

TR 213

Good

Over: STREAM

NW-7-T13NR4W, Mercer, IL

Built 1985 Load: 32.4 t ADT: 25

TR 100

Good

Over: WILDCAT CREEK

NW-3-T13NR4W, Mercer, IL

Built 1999 Load: 32.4 t ADT: 10

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