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Bridge conditions in Mahaska County, Iowa

221 inventoried bridges · 67 rated poor · 2025 National Bridge Inventory

United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled August 20, 2026

Mahaska County has 67 bridges rated poor out of 221 inventoried, a 30.3% share that puts it well above the national rate of about 7%.

67 of the 221 bridges in Mahaska County, Iowa, are rated in poor condition (30.3%) in the 2025 National Bridge Inventory, as of August 20, 2026.
65 bridges (29.4%) are rated good and 89 (40.3%) fair.
The median Mahaska County bridge was built in 1970.
The busiest poor-rated bridge is Old Ia 102 over Buckley Creek (built 1967), carrying about 2,340 vehicles a day.

Good 29.4% · Fair 40.3% · Poor 30.3% of 221 bridges

Bridges rated poor

Every bridge in the county with a poor rating, busiest first. Poor means a major component is rated 4 or lower on FHWA's 0-9 scale; it is a repair flag, not a closure notice.

Bridge	Built	Vehicles/day	Condition
Old Ia 102 over Buckley Creek	1967	2,340	Poor
FM over Cedar Creek	1963	470	Poor
FM over S Skunk River	1967	430	Poor
FM over N Skunk River	1966	370	Poor
FM over N Skunk River Overflow	1961	370	Poor
FM over over UP RR	1961	370	Poor
FM over So Skunk River	1956	290	Poor
Local over Little Muchakinock	1965	290	Poor
Local over Muchakinock Creek	1949	180	Poor
FM over N Skunk River	1951	140	Poor
FM over Buckley Creek	1956	140	Poor
Local over Drainage	1958	131	Poor
Local over Buckley Creek	1929	131	Poor
Local over Spring Creek	1965	120	Poor
Local over Drainage	1963	100	Poor
Local over Muchakinock Creek	1957	100	Poor
Local over Drainage	1957	100	Poor
Local over Spring Creek	1964	90	Poor
Local over Painter Creek	1951	90	Poor
Local over Olive Branch Creek	1956	80	Poor
Local over S Coal Creek	1951	80	Poor
Local over Drainage	1973	80	Poor
Local over Drainage	1950	80	Poor
Local over Coal Creek	1900	71	Poor
Local over N Coal Creek	1956	71	Poor
Local over Price Creek	1970	71	Poor
Local over St Joseph Creek	1959	71	Poor
Local over Spring Creek	1948	71	Poor
Local over Drainage	1957	71	Poor
FM over Buckley Creek	1951	70	Poor
Local over Drainage	1960	60	Poor
Local over Muchakinoch Creek	1951	60	Poor
Local over Stream	1953	60	Poor
Local over Bluff Creek	1948	50	Poor
Local over Turkey Run	1948	50	Poor
Local over Little Bluff Ck	1955	50	Poor
Local over Muchakinoch Creek	1951	50	Poor
Local over Drainage	1948	45	Poor
290TH St over Drainage Ditch #2	1900	45	Poor
Local over Drainage	1951	45	Poor
Local over Stream	1953	45	Poor
Local over Drainage	1950	45	Poor
Local over M Br Buckley Creek	1950	45	Poor
FM over Drainage Ditch #2	1951	40	Poor
Local over Middle Creek	1965	40	Poor
Local over Middle Creek	1963	40	Poor
Local over Drainage	1955	40	Poor
FM over Drainage	1951	35	Poor
G13 110TH St over N Skunk River	1960	35	Poor
Local over Drainage	1950	34	Poor
FM over Olive Branch Creek	1950	30	Poor
Local over Drainage	1957	30	Poor
FM over Buck Creek	1957	30	Poor
FM over Drainage	1954	30	Poor
Local over Cedar Creek	1973	26	Poor
FM over N Coal Creek	1953	20	Poor
Local over Drainage	1957	20	Poor
Local over Cedar Creek	1951	20	Poor
Local over Drainage	1956	15	Poor
Local over Pleasant Creek	1949	15	Poor
Local over Pleasant Creek	1956	15	Poor
Local over N Coal Creek	1955	11	Poor
Local over Bluff Creek	1973	11	Poor
Local over Drainage Ditch #2	1900	11	Poor
Local over Drainage	1956	5	Poor
Local over Pleasant Creek	1956	5	Poor
Local over Drainage	1900	5	Poor

Busiest bridges in the county

Bridge	Built	Vehicles/day	Condition
US 63 over Nenebec Creek	1998	12,500	Fair
Ia 163 over Muchakinok Creek	1997	12,200	Fair
Ia 163 over Little Muchikinock Creek	1995	7,800	Fair
US 63 over Little Muchakinock Creek	1963	6,600	Fair
Ia 92 over Spring Creek/pedestrian	1958	6,400	Fair
US 63 over Stream	1982	6,350	Good
US #63 over Muchakinock Creek	2001	6,350	Good
SB US 63 over Muchakinok Creek	1997	6,250	Good
US 63 SB Ia 163 EB over Muchakinock Creek	2001	6,250	Good
NB US 63 over Muchakinok Creek	1997	6,250	Good

Source: FHWA National Bridge Inventory, 2025. Counts cover inventoried highway bridges over 20 feet; ratings are reported by the state DOT.

Every bridge in Mahaska County → - all 221, busiest first, each with its own condition record.

All of Iowa: Iowa bridge conditions by county · every download on the data page.

Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.