US Bridges

Telegraph RD over Blackhawk CR

Fair

Scott County, Iowa · 078022591 · Structure no. 000000000505430

Built
1900
125 years old
Condition
Fair
inspected June 2023
Type
Slab
Concrete
Length
23 ft
1 main span
Daily traffic
899
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

Telegraph RD over Blackhawk CR is a concrete slab carrying Telegraph RD over Blackhawk CR in Scott County, Iowa. It was built in 1900, so it is 125 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.

It carries about 899 vehicles a day, projected to reach 899 by 2043. The structure is 23 ft (6.9 m) long and 20 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesTelegraph RD
CrossesBlackhawk CR
Location078022591
RouteCity Street 0
CountyScott County
StateIowa
Coordinates41.52383, -90.67065
Functional classUrban 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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating45.2 US tons
Inventory rating24.1 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length23 ft (6.9 m)
Longest span21 ft (6.5 m)
Deck width20 ft (6.2 m)
Roadway width18 ft (5.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic899 (2022)
Projected traffic899 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Telegraph RD over Blackhawk CR built?

It was built in 1900, making it 125 years old in 2025.

What condition is Telegraph RD over Blackhawk CR 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 June 2023.

How much traffic does Telegraph RD over Blackhawk CR carry?

About 899 vehicles per day (2022 count).

How long is Telegraph RD over Blackhawk CR?

The structure is 23 ft (6.9 m) long with a longest span of 21 ft (6.5 m) and a deck 20 ft wide.

Who owns Telegraph RD over Blackhawk CR?

It is owned by the City or Municipal Highway Agency.