Bridge conditions in Story County, Iowa
302 inventoried bridges · 40 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
Story County has 40 bridges rated poor out of 302 inventoried, a 13.2% share that puts it well above the national rate of about 7%.
- 40 of the 302 bridges in Story County, Iowa, are rated in poor condition (13.2%) in the 2025 National Bridge Inventory, as of .
- 102 bridges (33.8%) are rated good and 160 (53.0%) fair.
- The median Story County bridge was built in 1968.
- The busiest poor-rated bridge is Lincoln Way over Ioway Creek (built 1957), carrying about 8,224 vehicles a day.
Good 33.8% · Fair 53.0% · Poor 13.2% of 302 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 |
|---|---|---|---|
| Lincoln Way over Ioway Creek | 1957 | 8,224 | Poor |
| E15/115TH St over Long Dick Creek | 1964 | 1,028 | Poor |
| 8TH St over W Br Indian Creek | 1936 | 535 | Poor |
| 590TH Ave over Grant 5 Open Ditch | 1938 | 230 | Poor |
| 325TH St over Rock Creek Overflow | 1953 | 190 | Poor |
| 280TH St over Grant 5 Open Ditch Ext | 1916 | 131 | Poor |
| 190TH St over Ioway Creek | 1900 | 120 | Poor |
| 115TH St over Bear Creek | 1955 | 120 | Poor |
| 150TH St over Skunk River | 1920 | 100 | Poor |
| 310TH St over Drainage | 1951 | 90 | Poor |
| 632ND Ave over Stream | 1973 | 60 | Poor |
| 632ND Ave over West Br Indian Creek | 1938 | 60 | Poor |
| 280TH St over Skunk River | 1929 | 60 | Poor |
| 535TH Ave over Ballard Creek | 1920 | 60 | Poor |
| 710TH Ave over Middle Minerva Creek | 1953 | 60 | Poor |
| 650TH Ave over East Br Indian Creek | 1922 | 60 | Poor |
| 580TH Ave over Long Dick Creek | 1964 | 51 | Poor |
| 530TH Ave over Ballard Creek | 1953 | 50 | Poor |
| 640TH Ave over Calamus Creek | 1938 | 45 | Poor |
| 248TH St over East Br Indian Creek | 1936 | 40 | Poor |
| 325TH St over Small Stream | 1905 | 34 | Poor |
| 220TH St over East Br Indian Creek | 1900 | 34 | Poor |
| 560TH Ave over Hamilton-story 1 Open Dd | 1900 | 34 | Poor |
| 560TH Ave over Ham-story 1 Open Dd | 1924 | 34 | Poor |
| 520TH Ave over Keigley Branch | 1949 | 34 | Poor |
| 597TH Ave over Small Stream | 1974 | 30 | Poor |
| 110TH St over East Br Indian Creek | 1968 | 30 | Poor |
| 150TH St over East Br Indian Creek | 1950 | 30 | Poor |
| 100TH St over Small Stream | 1917 | 30 | Poor |
| 142ND St over Bear Creek | 1900 | 30 | Poor |
| 675TH Ave over Rock Creek | 1911 | 20 | Poor |
| 270TH St over Drainage Ditch 2 | 1951 | 20 | Poor |
| No Name SE over Small Stream | 1918 | 15 | Poor |
| 248TH St over Dye Creek | 1939 | 15 | Poor |
| 180TH St over West Br Indian Creek | 1900 | 15 | Poor |
| 720TH Ave over Hardin-story Dd 1 | 1900 | 15 | Poor |
| 120TH St over East Br Indian Creekh | 1919 | 15 | Poor |
| 100TH St over Keigley Branch | 1900 | 15 | Poor |
| Local-dead End over Skunk River | 1876 | 11 | Poor |
| 140TH St over East Br Indian Creek | 1924 | 5 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-35 over Ballard Creek | 1964 | 48,300 | Fair |
| I-35 over Walnut Creek | 1964 | 48,300 | Fair |
| I 35 over South Skunk Rvr Overflow | 2017 | 48,300 | Good |
| I-35 over Drainage Ditch | 1967 | 28,300 | Good |
| US 69 over Ioway Creek | 1924 | 24,600 | Good |
| NB I-35 over Bike Path | 1964 | 24,150 | Fair |
| I 35 NB over South Skunk River | 2018 | 24,150 | Good |
| US 30 over Worrell Creek | 1971 | 23,700 | Good |
| SB I-35 over Bike Path | 1964 | 23,300 | Fair |
| I 35 SB over South Skunk River | 2017 | 23,300 | Good |
Source: FHWA National Bridge Inventory, 2025. Counts cover inventoried highway bridges over 20 feet; ratings are reported by the state DOT.
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.