US Bridges

FM over Br Big Cedar Ck DD#21

Poor

Pocahontas County, Iowa · 092331801 · Structure no. 000000000279581

Built
1975
50 years old
Condition
Poor
inspected October 2024
Type
Slab
Concrete Continuous
Length
78 ft
3 main spans
Daily traffic
230
2022 count
Owner
County
County Highway Agency

About this bridge

FM over Br Big Cedar Ck DD#21 is a concrete continuous slab carrying FM over Br Big Cedar Ck DD#21 in Pocahontas County, Iowa. It was built in 1975, so it is 50 years old, older than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 230 vehicles a day, roughly 23% of them trucks, projected to reach 230 by 2044. The structure is 78 ft (23.8 m) long and 36 ft wide. If it were closed, the detour would be 5 mi (8 km).

CarriesFM
CrossesBr Big Cedar Ck DD#21
Location092331801
RouteCounty Highway 0
StateIowa
Coordinates42.79029, -94.78754
Functional classRural Major Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating57.8 US tons
Inventory rating36.4 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length78 ft (23.8 m)
Longest span29 ft (8.8 m)
Deck width36 ft (11 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic230 (2022)
Projected traffic230 by 2044
Trucks23%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was FM over Br Big Cedar Ck DD#21 built?

It was built in 1975, making it 50 years old in 2025.

What condition is FM over Br Big Cedar Ck DD#21 in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in October 2024.

How much traffic does FM over Br Big Cedar Ck DD#21 carry?

About 230 vehicles per day (2022 count), of which roughly 23% are trucks.

How long is FM over Br Big Cedar Ck DD#21?

The structure is 78 ft (23.8 m) long with a longest span of 29 ft (8.8 m) and a deck 36 ft wide.

Who owns FM over Br Big Cedar Ck DD#21?

It is owned by the County Highway Agency.