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 110

Over: LITTLE CAMP CR

NW-35-T15NR4W, Mercer, IL

Built 1900 Load: 9.7 t ADT: 25

TR 284

Over: N.HENDERSON CREEK

NW-13-T13NR1W, Mercer, IL

Built 1960 Load: 14.6 t ADT: 25

TR 250

Over: HENDERSON CREEK

W.CTR-17-T13NR1W, Mercer, IL

Built 1957 Load: 16.8 t ADT: 10

TR 204

Over: CAMP CREEK

NE-19-T15NR2W, Mercer, IL

Built 1900 Load: 17.5 t ADT: 25

FAS 206-CH 4

Over: CAMP CREEK

SW-12-T15NR1W, Mercer, IL

Built 1958 Load: 21.1 t ADT: 1,100

FAS 212-CH 9

Over: EDWARDS RIVER

SW.COR-8-T14NR4W, Mercer, IL

Built 1955 Load: 22.0 t ADT: 300

TR 278

Over: CAMP CREEK

SE-16-T15NR1W, Mercer, IL

Built 1900 Load: 22.0 t ADT: 375

TR 22

Over: WINTERS CREEK

SW-3-T14NR5W, Mercer, IL

Built 1965 Load: 22.7 t ADT: 25

FAS 1405-CH 12

Over: NORTH HENDERSON CR

W.CTR-14-T13NR1W, Mercer, IL

Built 1956 Load: 23.7 t ADT: 50

FAS 206-CH 4

Over: EDWARDS RIVER

S.CTR-24-T15NR1W, Mercer, IL

Built 1947 Load: 23.7 t ADT: 950

FAS 214-CH 13

Over: DOUGLAS CREEK

SE-2-T13NR4W, Mercer, IL

Built 1942 Load: 24.3 t ADT: 100

FAS 214-CH 13

Over: LITTLE CAMP CREEK

E.CTR-34-T15NR4W, Mercer, IL

Built 1948 Load: 24.3 t ADT: 75

TR 196

Over: GOOSE RUN

NW-19-T13NR2W, Mercer, IL

Built 1975 Load: 24.3 t ADT: 25

TR 284

Over: N. POPE CREEK

NW-24-T14NR1W, Mercer, IL

Built 1963 Load: 24.3 t ADT: 75

TR 183A

Over: POPE CREEK

CTR-26-T14NR2W, Mercer, IL

Built 1964 Load: 24.9 t ADT: 75

TR 247

Over: MAIDS RUN CREEK

NE-23-T13NR3W, Mercer, IL

Built 1972 Load: 25.3 t ADT: 25

TR 162

Over: MAIDS RUN

CTR-22-T13NR3W, Mercer, IL

Built 1978 Load: 25.3 t ADT: 50

TR 253

Over: SNAKE CREEK

CTR-25-T13NR4W, Mercer, IL

Built 1958 Load: 26.9 t ADT: 25

FAS 214-CH 13

Over: EDWARDS RIVER

W.CTR-11-T14NR4W, Mercer, IL

Built 1968 Load: 27.2 t ADT: 250

TR 136A

Over: N HENDERSON CR

SW-20-T13NR3W, Mercer, IL

Built 1974 Load: 27.9 t ADT: 25

TR 258

Over: N. HENDERSON CREEK

W.CTR-16-T13NR1W, Mercer, IL

Built 1969 Load: 28.2 t ADT: 25

TR 109

Over: ELIZA LAKE DITCH

SW-2-T14NR6W, Mercer, IL

Built 1986 Load: 28.2 t ADT: 50

FAS 206-CH 4

Over: PARKER RUN

SE-36-T15NR1W, Mercer, IL

Built 1976 Load: 28.8 t ADT: 950

TR 202

Over: DUGOUT RUN

NW-29-T14NR2W, Mercer, IL

Built 1964 Load: 29.2 t ADT: 25

FAS 1405-CH 12

Over: POPE CREEK

SW-35-T14NR1W, Mercer, IL

Built 1971 Load: 29.5 t ADT: 50

FAS 1405-CH 12

Over: NORTH POPE CREEK

NW-23-T14NR1W, Mercer, IL

Built 1971 Load: 31.8 t ADT: 100

TR 282

Over: CAMP CREEK

SE-10-T15NR1W, Mercer, IL

Built 1977 Load: 31.8 t ADT: 200

TR 190

Over: CAMP CREEK

SE-23-T15NR3W, Mercer, IL

Built 1980 Load: 31.8 t ADT: 25

TR 226

Over: TOMS CREEK

SE-35-T13NR2W, Mercer, IL

Built 1979 Load: 32.1 t ADT: 50

ILL 94

Over: POPE CREEK

3.9 MI S OF ILL 17, Mercer, IL

Built 1924 Load: 32.4 t ADT: 1,900

FAS 1216-CH 3

Over: NORTH HENDERSON CR

SW-20-T13NR2W, Mercer, IL

Built 1972 Load: 32.4 t ADT: 25

TR 259

Over: TOMS CREEK

NW-31-T13NR1W, Mercer, IL

Built 1988 Load: 32.4 t ADT: 50

TR 1

Over: DUCK CREEK

SE-32-T13NR3W, Mercer, IL

Built 1984 Load: 32.4 t ADT: 20

TR 212

Over: POPE CREEK

E.CTR-33-T14NR2W, Mercer, IL

Built 1988 Load: 32.4 t ADT: 25

TR 128

Over: EDWARDS RIVER

W.CTR-7-T14NR3W, Mercer, IL

Built 1986 Load: 32.4 t ADT: 175

TR 165

Over: STURGEON BAY

NW-19-T14NR5W, Mercer, IL

Built 1980 Load: 32.4 t ADT: 50

TR 198

Over: CAMP CREEK

SW-19-T15NR2W, Mercer, IL

Built 1975 Load: 32.4 t ADT: 50

TR 114

Over: CAMP CREEK

SE-23-T15NR4W, Mercer, IL

Built 1981 Load: 32.4 t ADT: 75

TR 77

Over: CAMP CREEK

E.CTR-27-T15NR4W, Mercer, IL

Built 1986 Load: 32.4 t ADT: 25

TR 20

Over: KEATING CREEK

SW-8-T15NR5W, Mercer, IL

Built 1983 Load: 32.4 t ADT: 25

TR 105

Over: PARKER RUN

SW-27-T15NR1W, Mercer, IL

Built 1975 Load: 33.0 t ADT: 75

FAS 209-CH 14

Over: ELIZA CREEK

SE-30-T15NR5W, Mercer, IL

Built 1966 Load: 33.4 t ADT: 1,300

TR 138B

Over: CAMP CREEK

SE-19-T15NR3W, Mercer, IL

Built 1980 Load: 34.7 t ADT: 25

TR 146

Over: CAMP CREEK

SW-20-T15NR3W, Mercer, IL

Built 1980 Load: 34.7 t ADT: 25

TR 53

Over: CAMP CREEK

NW-21-T15NR1W, Mercer, IL

Built 1969 Load: 35.0 t ADT: 275

TR 215

Over: WILDCAT CR

NW-9-T13NR4W, Mercer, IL

Built 1971 Load: 35.3 t ADT: 10

TR 111

Over: CAMP CREEK

NW-8-T14NR4W, Mercer, IL

Built 1981 Load: 35.3 t ADT: 25

Ill 17

Over: Edwards River

5 mi W of Joy, Mercer, IL

Built 2019 Load: 35.6 t ADT: 1,500

TR 198

Over: N. CAMP CREEK

SW-18-T15NR2W, Mercer, IL

Built 1983 Load: 35.6 t ADT: 50

ILL 94

Over: CAMP CREEK

5 MI N OF ALEDO, Mercer, IL

Built 1960 Load: 36.9 t ADT: 2,900

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 5, 2026