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County:St. Mary's Project Number:SM351_11
MD 0004 SOLOMONS ISLAND RD/PATUXENT BEACH RD UPGRADE BETWEEN MD 2 AND MD 235
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This is a PDF Attachment, double click to view:April 2015:  MD 4 Mainline Widening and Patuxent River Crossing (Thomas Johnson Bridge) in Calvert County April 2015: MD 4 Mainline Widening and Patuxent River Crossing (Thomas Johnson Bridge) in Calvert County

MD 4 Mainline in Calvert County: The roadway would be widened within the existing grass median to provide a four-foot-wide shoulder in each direction, from north of the Patuxent River crossing to the MD 4/Patuxent Point Parkway intersection. The new median width would be approximately 22 feet. The existing exit from northbound MD 4 to southbound Solomons Island Road closest to the Visitor’s Center, and the existing entrance from Solomons Island Road to MD 4 northbound would be closed. Both would be replaced by a new right-in/right-out access point for MD 4 northbound/Solomons Island Road approximately 1,000 feet north of the closed access. The remaining access points along MD 4 would not be altered.

Patuxent River Crossing (Thomas Johnson Bridge) Alternative 4: Four-Lane Parallel Span: A new bridge consisting of two 12-foot-wide lanes, a four-foot-wide inside shoulder, and a 10-foot-wide outside shoulder, would be built parallel to the south side of the existing Thomas Johnson Bridge. A 10-foot-wide shared-use pedestrian/bicyclist lane would be added on one side of the bridge and would be separated from the shoulder by a concrete barrier. The final height of the bridge, recommended to be between 70 to 140-feet, would be determined during final engineering. Upon completion of the new bridge, the existing bridge would be demolished.
This is a PDF Attachment, double click to view:April 2015: MD 4/MD 235 - Single-Point Urban Interchange (SPUI), St. Mary's County April 2015: MD 4/MD 235 - Single-Point Urban Interchange (SPUI), St. Mary's County

The SPUI would be a grade-separated interchange, with MD 235 crossing over MD 4 on a bridge. MD 4 would remain at its existing grade. All through traffic on MD 235 would be free-flowing (without a traffic signal) with two lanes in each direction. Ramps would be used to direct all left turns between MD 235 and MD 4 to a single signalized intersection under the bridge, which would also control the through movements on MD 4. MD 4 would have two through lanes in each direction. A bicycle and pedestrian path would be provided through the intersection and connect with the county’s proposed Three Notch Trail. Service roads would be provided behind the properties along northbound MD 235, and existing direct access to those properties from MD 235 would be eliminated.
This is a PDF Attachment, double click to view:April 2015: MD 4 Mainline, St. Mary's County - Four-Lane Roadway with Open Median and Separate Bicyclist/Pedestrian Path April 2015: MD 4 Mainline, St. Mary's County - Four-Lane Roadway with Open Median and Separate Bicyclist/Pedestrian Path

would be widened to a four-lane divided roadway from Oak Drive to North Patuxent Beach Road, with a 30-foot-wide median. The typical section would consist of two 12-foot-wide lanes in each direction, 10-foot-wide outside shoulders, and four-foot-wide inside shoulders.

The two southbound lanes would be constructed to the north of the existing two-lane roadway. The northbound lanes would be constructed along the existing roadway. Turn lanes may be added to all intersections along MD 4. A 10-foot-wide bicycle and pedestrian facility to be constructed to the south side of MD 4, and separated by a 10-foot-wide buffer is included.

North of Patuxent Beach Road, the entire MD 4 section would be shifted to the south of the existing roadway. The median narrows, and two through-lanes would be provided in each direction. The northern connection of Patuxent Beach Road at MD 4 intersection would have a median island to channelize the left-turns from MD 4 and to prohibit all crossing movements from Patuxent Beach
Study Area
This is a PDF Attachment, double click to view:MD 4 - Thomas Johnson Bridge Planning Study Study Area Map MD 4 - Thomas Johnson Bridge Planning Study Study Area Map

Vicinity Maps
This is a PDF Attachment, double click to view:MD 4 - Thomas Johnson Bridge Planning Study Vicinity Map MD 4 - Thomas Johnson Bridge Planning Study Vicinity Map

 
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