Mahaska County, IA

219 public highway bridges

Mahaska County Bridge Snapshot

Mahaska County, Iowa contains 219 public highway bridges in the FHWA National Bridge Inventory. Roughly 24.7% are rated “Good,” 38.8% “Fair,” 33.3% “Poor,” and 33.3% 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 IA 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.

219

Total Bridges

24.7%

Good

33.3%

Poor

33.3%

Structurally Deficient

Condition Distribution

Good

24.7% (54)

Fair

38.8% (85)

Poor

33.3% (73)

SD

33.3% (73)

All Bridges (219)

Sort:

NEWPORT AVE

Over: SPRING CREEK

075150510, Mahaska, IA

Built 2006 Load: 32.7 t ADT: 150

255TH ST

Over: SPRING CREEK

075152103, Mahaska, IA

Built 2012 Load: 32.7 t ADT: 90

FM

Over: SPRING CREEK

075152705, Mahaska, IA

Built 2003 Load: 32.7 t ADT: 130

FM

Over: PAINTER CREEK

075160201, Mahaska, IA

Built 2010 Load: 32.7 t ADT: 150

245TH ST

Over: DRAINAGE

075161707, Mahaska, IA

Built 2003 Load: 32.7 t ADT: 131

FM

Over: MUCHAKINOCK CREEK

075162709, Mahaska, IA

Built 2001 Load: 32.7 t ADT: 620

FM

Over: LITTLE MUCHAKINOCK CREEK

075163502, Mahaska, IA

Built 2007 Load: 32.7 t ADT: 200

LOCAL

Over: ST JOSEPH CREEK

075171406, Mahaska, IA

Built 2003 Load: 32.7 t ADT: 50

FM

Over: ST JOSEPH CREEK

075172406, Mahaska, IA

Built 1999 Load: 32.7 t ADT: 160

LOCAL

Over: ST JOSEPH CREEK

075172505, Mahaska, IA

Built 1994 Load: 32.7 t ADT: 50

LOCAL

Over: CEDAR CREEK

076140101, Mahaska, IA

Built 1993 Load: 32.7 t ADT: 5

200TH ST

Over: DRAINAGE

076143001, Mahaska, IA

Built 2011 Load: 32.7 t ADT: 20

LOCAL

Over: STREAM

076150502, Mahaska, IA

Built 1983 Load: 32.7 t ADT: 50

FM

Over: DRAINAGE

076162503, Mahaska, IA

Built 1989 Load: 32.7 t ADT: 80

FM

Over: BLACK OAK CREEK

076171002, Mahaska, IA

Built 2003 Load: 32.7 t ADT: 170

LOCAL

Over: MUCHAKINOCK CREEK

076172001, Mahaska, IA

Built 1999 Load: 32.7 t ADT: 34

LOCAL

Over: PLEASANT CREEK

077142201, Mahaska, IA

Built 1998 Load: 32.7 t ADT: 60

FM

Over: BALLINGER CREEK

077163204, Mahaska, IA

Built 2010 Load: 32.7 t ADT: 50

OLD IA 102

Over: SOUTH SKUNK RIVER

077172812, Mahaska, IA

Built 1990 Load: 32.7 t ADT: 2,340

FM

Over: N.SKUNK RIVER OVERFLOW

077143304, Mahaska, IA

Built 1991 Load: 32.7 t ADT: 320

FM

Over: DRAINAGE

075163204, Mahaska, IA

Built 2001 Load: 32.7 t ADT: 620

US 63

Over: TRIB. TO MUCHAKINOCK

5.2 MILES N OF JCT IA 137, Mahaska, IA

Built 1997 Load: 32.7 t ADT: 6,250

FM

Over: BUCKLEY CREEK(MIDDLE BR)

077170404, Mahaska, IA

Built 1984 Load: 32.8 t ADT: 1,130

G63 305TH ST

Over: DRAINAGE

074151303, Mahaska, IA

Built 2016 Load: 33.0 t ADT: 120

LOCAL

Over: MUCHAKINOCK CREEK

075162701, Mahaska, IA

Built 1985 Load: 33.5 t ADT: 71

US 63

Over: UP RR

1.8 MI. N OF JCT. SR T65, Mahaska, IA

Built 2008 Load: 33.8 t ADT: 3,250

LOCAL

Over: BALLINGER CREEK

076170204, Mahaska, IA

Built 1993 Load: 34.5 t ADT: 34

100TH ST

Over: S.ENGLISH RIVER

077140201, Mahaska, IA

Built 1997 Load: 34.5 t ADT: 110

FM

Over: N SKUNK RIVER

077143306, Mahaska, IA

Built 1991 Load: 35.3 t ADT: 320

WB/NB IA 163

Over: OVER UP RR

1.1 MI. E OF JCT. IA 92, Mahaska, IA

Built 1997 Load: 35.6 t ADT: 3,900

FM

Over: MIDDLE CREEK

076143306, Mahaska, IA

Built 1991 Load: 36.3 t ADT: 320

FM

Over: DM RIVER

074160504, Mahaska, IA

Built 2010 Load: 37.2 t ADT: 620

FM

Over: BLUFF CREEK

074162002, Mahaska, IA

Built 1991 Load: 37.9 t ADT: 100

EB/SB IA 163

Over: OVER UP RR

1.1 mi. E of Jct. IA 92, Mahaska, IA

Built 1996 Load: 38.1 t ADT: 3,900

US #63

Over: MUCHAKINOCK CREEK

2.4 mi. N of Jct. IA 137, Mahaska, IA

Built 2001 Load: 39.4 t ADT: 6,250

US 63 SB IA 163 EB

Over: MUCHAKINOCK CREEK

2.4 mi. N of Jct. IA 137, Mahaska, IA

Built 2001 Load: 39.4 t ADT: 6,250

G73 (325TH ST)

Over: BLUFF CREEK

074172703, Mahaska, IA

Built 2012 Load: 42.3 t ADT: 50

NB US 63

Over: MUCHAKINOK CREEK

0.3 MILES SOUTH OF SR G71, Mahaska, IA

Built 1997 Load: 42.4 t ADT: 6,250

SB US 63

Over: MUCHAKINOK CREEK

0.3 mi. S of Jct. SR G71, Mahaska, IA

Built 1997 Load: 42.6 t ADT: 6,250

IA 92

Over: ST JOSEPHS CREEK

3.7 mi. E of Jct. SR T25, Mahaska, IA

Built 1979 Load: 47.9 t ADT: 3,240

LOCAL

Over: BUCK CREEK

077150501, Mahaska, IA

Built 1996 Load: 48.2 t ADT: 34

LOCAL

Over: BUCKLEY CREEK

077172203, Mahaska, IA

Built 1994 Load: 48.2 t ADT: 50

255TH ST

Over: LAKE KEOMAH

0.9 mi.E of SR Queens Ave, Mahaska, IA

Built 2006 Load: 52.2 t

FM

Over: CEDAR CREEK

074143402, Mahaska, IA

Built 1991 Load: 52.9 t ADT: 20

LOCAL

Over: LITTLE MUCHAKINOCK CREEK

075162606, Mahaska, IA

Built 1988 Load: 52.9 t ADT: 210

FM

Over: MUCHAKINOCK CREEK

075163410, Mahaska, IA

Built 2007 Load: 52.9 t ADT: 90

FM

Over: CEDAR CREEK

074141902, Mahaska, IA

Built 1963 ADT: 470

LOCAL

Over: DRAINAGE DITCH #2

075163306, Mahaska, IA

Built 1900 ADT: 11

G13 110TH ST

Over: N SKUNK RIVER

077150703, Mahaska, IA

Built 1960 Load: 4.5 t ADT: 35

LOCAL

Over: DRAINAGE

077152301, Mahaska, IA

Built 1900 Load: 7.3 t ADT: 5

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