US Bridges

100th ST over Long Dick Creek

FairPosted for load

Story County, Iowa · 085230301 · Structure no. 000000000316100

Built
1956
69 years old, rebuilt 1974
Condition
Fair
inspected December 2022
Type
Truss - Thru
Steel
Length
92 ft
1 main span
Daily traffic
45
2022 count
Owner
County
County Highway Agency

About this bridge

100th ST over Long Dick Creek is a steel truss - thru carrying 100th ST over Long Dick Creek in Story County, Iowa. It was built in 1956 and reconstructed in 1974, so it is 69 years old, older than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 45 vehicles a day, projected to reach 45 by 2043. The structure is 92 ft (28 m) long and 17 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
Carries100th ST
CrossesLong Dick Creek
Location085230301
RouteCounty Highway 0
CountyStory County
StateIowa
Coordinates42.20926, -93.51619
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2022
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating19 US tons
Inventory rating13 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckWood or timber
Main spans1
Design loadUnknown
Structure length92 ft (28 m)
Longest span90 ft (27.4 m)
Deck width17 ft (5.2 m)
Roadway width16 ft (4.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic45 (2022)
Projected traffic45 by 2043
Trucks0%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 100th ST over Long Dick Creek built?

It was built in 1956, making it 69 years old in 2025. It was reconstructed in 1974.

What condition is 100th ST over Long Dick Creek in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in December 2022.

How much traffic does 100th ST over Long Dick Creek carry?

About 45 vehicles per day (2022 count).

How long is 100th ST over Long Dick Creek?

The structure is 92 ft (28 m) long with a longest span of 90 ft (27.4 m) and a deck 17 ft wide.

Who owns 100th ST over Long Dick Creek?

It is owned by the County Highway Agency.