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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%.

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.

BridgeBuiltVehicles/dayCondition
Lincoln Way over Ioway Creek19578,224Poor
E15/115TH St over Long Dick Creek19641,028Poor
8TH St over W Br Indian Creek1936535Poor
590TH Ave over Grant 5 Open Ditch1938230Poor
325TH St over Rock Creek Overflow1953190Poor
280TH St over Grant 5 Open Ditch Ext1916131Poor
190TH St over Ioway Creek1900120Poor
115TH St over Bear Creek1955120Poor
150TH St over Skunk River1920100Poor
310TH St over Drainage195190Poor
632ND Ave over Stream197360Poor
632ND Ave over West Br Indian Creek193860Poor
280TH St over Skunk River192960Poor
535TH Ave over Ballard Creek192060Poor
710TH Ave over Middle Minerva Creek195360Poor
650TH Ave over East Br Indian Creek192260Poor
580TH Ave over Long Dick Creek196451Poor
530TH Ave over Ballard Creek195350Poor
640TH Ave over Calamus Creek193845Poor
248TH St over East Br Indian Creek193640Poor
325TH St over Small Stream190534Poor
220TH St over East Br Indian Creek190034Poor
560TH Ave over Hamilton-story 1 Open Dd190034Poor
560TH Ave over Ham-story 1 Open Dd192434Poor
520TH Ave over Keigley Branch194934Poor
597TH Ave over Small Stream197430Poor
110TH St over East Br Indian Creek196830Poor
150TH St over East Br Indian Creek195030Poor
100TH St over Small Stream191730Poor
142ND St over Bear Creek190030Poor
675TH Ave over Rock Creek191120Poor
270TH St over Drainage Ditch 2195120Poor
No Name SE over Small Stream191815Poor
248TH St over Dye Creek193915Poor
180TH St over West Br Indian Creek190015Poor
720TH Ave over Hardin-story Dd 1190015Poor
120TH St over East Br Indian Creekh191915Poor
100TH St over Keigley Branch190015Poor
Local-dead End over Skunk River187611Poor
140TH St over East Br Indian Creek19245Poor

Busiest bridges in the county

BridgeBuiltVehicles/dayCondition
I-35 over Ballard Creek196448,300Fair
I-35 over Walnut Creek196448,300Fair
I 35 over South Skunk Rvr Overflow201748,300Good
I-35 over Drainage Ditch196728,300Good
US 69 over Ioway Creek192424,600Good
NB I-35 over Bike Path196424,150Fair
I 35 NB over South Skunk River201824,150Good
US 30 over Worrell Creek197123,700Good
SB I-35 over Bike Path196423,300Fair
I 35 SB over South Skunk River201723,300Good

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.