US Bridges

Md 488 over Kerrick Swamp

Fair

Charles County, Maryland · 1.99 Miles East of Md 6 · Structure no. 100000080046010

Built
1931
94 years old, rebuilt 1976
Condition
Fair
inspected December 2023
Type
Slab
Concrete
Length
41 ft
2 main spans
Daily traffic
6,540
2009 count
Owner
State
State Highway Agency

About this bridge

Md 488 over Kerrick Swamp is a concrete slab carrying Md 488 over Kerrick Swamp in Charles County, Maryland. It was built in 1931 and reconstructed in 1976, so it is 94 years old, older than the Maryland average of 52.6 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 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 6,540 vehicles a day, roughly 8% of them trucks, projected to reach 7,990 by 2026. The structure is 41 ft (12.5 m) long and 58 ft wide. If it were closed, the detour would be 29.8 mi (48 km).

CarriesMd 488
CrossesKerrick Swamp
Location1.99 Miles East of Md 6
RouteState Highway 488
Coordinates38.5435, -76.92711
Functional classRural Major Collector

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating58 US tons
Inventory rating34.9 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length41 ft (12.5 m)
Longest span18 ft (5.5 m)
Deck width58 ft (17.7 m)
Roadway width48 ft (14.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,540 (2009)
Projected traffic7,990 by 2026
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed29.8 mi (48 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Md 488 over Kerrick Swamp built?

It was built in 1931, making it 94 years old in 2025. It was reconstructed in 1976.

What condition is Md 488 over Kerrick Swamp 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 2023.

How much traffic does Md 488 over Kerrick Swamp carry?

About 6,540 vehicles per day (2009 count), of which roughly 8% are trucks.

How long is Md 488 over Kerrick Swamp?

The structure is 41 ft (12.5 m) long with a longest span of 18 ft (5.5 m) and a deck 58 ft wide.

Who owns Md 488 over Kerrick Swamp?

It is owned by the State Highway Agency.