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County:Calvert Project Number:SM351_11
MD 0004 SOLOMONS ISLAND RD/PATUXENT BEACH RD UPGRADE BETWEEN MD 2 AND MD 235
Maps
Vicinity Map
MD 4 - Thomas Johnson Bridge Planning Study Vicinity Map
This is a PDF attachment, double click to view: MD 4 - Thomas Johnson Bridge Planning Study Vicinity Map

 


Study Area
MD 4 - Thomas Johnson Bridge Planning Study Study Area Map
This is a PDF attachment, double click to view: MD 4 - Thomas Johnson Bridge Planning Study Study Area Map

 


Alternatives for Workshop
Alternative 2 - TSM/TDM
This is a PDF attachment, double click to view: Alternative 2 - TSM/TDM

A number of potential strategies were developed as Transportation System Management (TSM) and Transportation Demand Management (TDM) solutions. These include removing the off-ramp from northbound MD 4 leading to Solomons Island, closing the northernmost entrance to South Patuxent Beach Road, providing modified Tee intersections along MD 4, and converting the existing shoulder to a travel lane to provide two travel lanes along northbound MD 4 from MD 235 to the Thomas Johnson Bridge. Separating the intersection improvement options from the mainline MD 4 options is also a potential strategy.

 
Alternative 3 - Two-Lane Parallel Span
This is a PDF attachment, double click to view: Alternative 3 - Two-Lane Parallel Span

Alternative 3 is a new, two-lane bridge that will be built parallel to the existing bridge. With this alternative, the existing bridge will be kept open to traffic and will be converted to carry traffic in the southbound direction. The new span will carry traffic in the northbound direction. This span will consist of two 12 foot-wide travel lanes, a four-foot-wide inside shoulder, and a 10-foot-wide outside shoulder. In addition, the bridge will have a 10-foot-wide shared use bicycle/pedestrian path separated by a concrete barrier. To avoid the piles and footings of the existing bridge, the new bridge will be placed a minimum of 25 to 75 feet from the existing bridge, depending on the size and placement of the existing piles and footings. The vertical profile of the bridge is expected to stay the same, with a 140-foot-high vertical clearance in the Patuxent River shipping channel.

 
Alternative 4 - Four-Lane Parallel Span
This is a PDF attachment, double click to view: Alternative 4 - Four-Lane Parallel Span

Alternative 4 is a new four-lane bridge that will be built parallel to the existing bridge. Upon completion of the new bridge, the existing bridge will be demolished. In each direction, the bridge will consist of two 12-foot-wide lanes, a four-foot-wide inside shoulder, and a 10-foot-wide outside shoulder. In addition, there will be a 10-foot-wide shared use bicycle/pedestrian lane on one side of the bridge, which will be separated from the shoulder by a concrete barrier. To avoid the piles and footings of the existing bridge, the new bridge will be placed a minimum of 25 to 75 feet from the existing bridge, depending on the size and placement of the existing piles and footings. The vertical profile of the bridge is expected to stay the same, with a 140-foot-high vertical clearance in the Patuxent River shipping channel. SHA is currently investigating options to reduce the height of the bridge with various agencies and local marinas.

 
Alternatives 3, 4 - Mainline Widening
This is a PDF attachment, double click to view: Alternatives 3, 4 - Mainline Widening

With Alternatives 3, 4, and 5, MD 4 is proposed to be widened to a four-lane divided roadway, with a 30-foot wide open grass median from north of the Patuxent River crossing to MD 235. The existing MD 4 will be converted to carry traffic in the northbound direction, and MD 4 will be expanded to the north. This option will consist of two 12-foot-wide lanes in each direction, a 10-foot-wide outside shoulder, and a four-foot-wide inside shoulder. Turning lanes may be added at all intersections along MD 4. An option for a 10-foot-wide bicycle/pedestrian facility to be constructed to the south side of MD 4, separated by a 10-foot-wide buffer, is included.

 
Alternative 5 - Four-Lane Myrtle Point Crossing
This is a PDF attachment, double click to view: Alternative 5 - Myrtle Point Crossing

Alternative 5 is a new four-lane bridge that will be built from the Naval Recreation Center in Calvert County to the terminus of Patuxent Boulevard in Myrtle Point in St. Mary’s County. In each direction, the bridge will consist of two 12-foot-wide lanes, a 4-foot-wide inside shoulder, and a 10-foot-wide outside shoulder. In addition, there will be a 10-foot-wide shared use bicycle/pedestrian lane on one side of the bridge, which will be separated from the shoulder by a concrete barrier. This alternative will avoid Myrtle Point Park, and will maintain access to the park. Road connections with existing MD 4 will be maintained. [This option has been dropped from further consideration.]

 
Option A - Continuous Flow Intersection
This is a PDF attachment, double click to view: Option A - Continuous Flow Intersection

This option takes left-turning traffic at the intersection of MD 4 and MD 235 and moves it to the left of oncoming traffic. This allows through traffic to go through the intersection without conflicting with the turning traffic. Under this option, each direction at the intersection will be made into a continuous flow leg. MD 4 will carry two through lanes in each direction, and MD 235 will maintain three through lanes in each direction.

 
Option B - At-Grade Intersection with 1-Directional Flyover
This is a PDF attachment, double click to view: Option B - At-Grade Intersection with One-Directional Flyover

This option takes traffic turning left from southbound MD 4, and moves it onto a single-lane flyover ramp to avoid the MD 4/MD 235 intersection. MD 4 will carry two through lanes in each direction, while MD 235 will maintain three through lanes in each direction. MD 235 will have two left-turning lanes in each direction, and northbound MD 4 will have two left-turning lanes. Northbound MD 235 will have a free-flowing right turn onto northbound MD 4, and northbound MD 4 will have a free-flowing right turn onto southbound MD 235.

 
Option C - Partial Cloverleaf Interchange
This is a PDF attachment, double click to view: Option C - Partial Cloverleaf Interchange

This option is a grade-separated interchange option, with MD 4 crossing over MD 235. Traffic turning from southbound MD 4 onto southbound MD 235 will travel straight through the interchange and then make a right turn onto a loop ramp to reach MD 235. The bridge over MD 235 will be six lanes, with two through lanes and a turn lane in each direction. [This option has been dropped from further consideration.]

 
Option D - Single Point Urban Interchange
This is a PDF attachment, double click to view: Option D - Single Point Urban Interchange

This option is a grade-separated interchange option, with MD 4 crossing over MD 235. This option keeps all through traffic on MD 235 flowing, and directs all left turns through an interchange above MD 235. With this option, right turns are free movements. Through traffic along MD 4 will also cross through the Single Point Urban Interchange, with two through lanes in each direction. MD 235 will have three through lanes in each direction.

 


Displays for Workshop
Environmental Features Mapping
This is a PDF attachment, double click to view: MD 4 - Thomas Johnson Bridge Planning Study Environmental Features

 


Hearing Alternatives
MD 4 Mainline: Calvert County
This is a PDF attachment, double click to view: MD 4 Mainline: Calvert County

This segement has two parts: the relocation of the ramp from northbound MD 4 to Solomons Island Road, and potential access modifications.

With any of the build alternatives, the existing ramp at the base of the bridge from northbound MD 4 to Solomons Island Road will need to be relocated. The team is currently proposing several options for relocating this ramp, including: Shifting the ramp approximately 1100 feet north and creating a "T" intersection with the parallel service road; shifting the ramp approximately 900 feet north and creating a four-way intersection with the service road and retail-center entrance; and removing the right-turn access and creating a left-turn access onto the existing off-ramp from southbound MD 4 toward the Solomons Island boat launch.

SHA has developed several additional options for access to and from the parallel service road for Solomons Island in response to feedback from citizens, business owners, and elected officials. These options include: A "no change" option that maintains the access points as they exist today, with the exception of the ramp from northbound MD 4 to Solomons at the base of the bridge; a "median widening" option that adds four-foot-wide shoulders to the inside of MD 4, reducing the width of the grass median to 22 feet; and an "access control" option that consolidates the access points to and from the service road between the base of the bridge and Patuxent Point Parkway.

 
Alternative 3: Two-Lane Parallel Span
This is a PDF attachment, double click to view: Alternative 3:  Two-Lane Parallel Span

Alternative 3 is a new, two-lane bridge that would be built parallel and to the south of the existing Thomas Johnson Bridge. With this alternative, the existing bridge would be kept open to traffic and converted to carry traffic in the southbound direction. The new span would carry traffic in the northbound direction and would consist of two 12-foot-wide travel lanes, a four-foot-wide inside shoulder, and a 10-foot-wide outside shoulder. In addition, the bridge would have a 10-foot-wide shared-use bicycle/pedestrian path separated by a concrete barrier.

SHA conducted mast height surveys for the Thomas Johnson Bridge in June 2008 and June 2009 to determine the minimum vertical clearance required for the proposed Patuxent River Crossing alternatives. Coordinaton with area marinas and the U.S. Navy to determine navigational requirements for the Patuxent River resulted in information that has led the team to consider two options for the bridge alternatives. Option A would lower the proposed vertical clearance to approximately 70 feet. Option B would maintain the existing 140-foot vertical clearance in the Patuxent River shipping channel. Option A or B can be applied to Alternatives 3 and 4.

 
Alternative 4: Four-Lane Parallel Span
This is a PDF attachment, double click to view: Alternative 4:  Four-Lane Parallel Span

Alternative 4 is a new four-lane bridge that would be built parallel and to the south of the existing Thomas Johnson Bridge. In each direction, the bridge would consist of two 12-foot-wide lanes, a four-foot-wide inside shoulder, and a 10-foot-wide outside shoulder. In addition, there would be a 10-foot-wide shared-use bicycle/pedestrian path on the south side of the bridge, separated from the shoulder by a concrete barrier. Upon completion of the new bridge, the existing bridge would be removed.

SHA conducted mast height surveys for the Thomas Johnson Bridge in June 2008 and June 2009 to determine the minimum vertical clearance required for the proposed Patuxent River Crossing alternatives. Coordinaton with area marinas and the U.S. Navy to determine navigational requirements for the Patuxent River resulted in information that has led the team to consider two options for the bridge alternatives. Option A would lower the proposed vertical clearance to approximately 70 feet. Option B would maintain the existing 140-foot vertical clearance in the Patuxent River shipping channel. Option A or B can be applied to Alternatives 3 and 4.

 
MD 4 Mainline: St. Mary's County
This is a PDF attachment, double click to view:  MD 4 Mainline:  St. Mary's County

MD 4 would be widened to a four-lane divided roadway from Patuxent Beach Road to just beyond Patuxent Boulevard in St. Mary’s County. The typical section would consist of two 12-foot-wide lanes, a 10-foot-wide outside shoulder, and a four-foot-wide inside shoulder in each direction, with a 30-foot-wide open grass median. Turn lanes could be added to intersections where needed along MD 4. An optional 10-foot-wide bicycle and pedestrian path could be constructed to the south side of MD 4, separated by a 10-foot-wide grass buffer.

 
MD 4/MD 235 Intersection Option A - Continuous Flow Intersection
This is a PDF attachment, double click to view:  MD 4/MD 235 Intersection Option A - Continuous Flow

This option would modify the existing traffic signal and add two new signals on the north and west legs of the intersection. The three traffic signals would be used to disperse traffic through the intersection. This option takes the primary left-turning traffic at the intersection of MD 4 and MD 235 and moves it to the left of oncoming traffic, allowing left turns to be made at the same time as through movements. MD 4 would carry two through lanes in each direction, and MD 235 would maintain three through lanes in each direction. A bicycle and pedestrian path would be provided through the intersections and connect with the county’s proposed Three Notch Trail.

 
MD 4/MD 235 Intersection Option B - At-Grade Intersection with One-Directional Flyover
This is a PDF attachment, double click to view:  MD 4/MD 235 Intersection Option B - At-Grade Inters

This option takes traffic turning left from southbound MD 4 to southbound MD 235 and moves it onto a single-lane flyover ramp to bypass the MD 4/MD 235 intersection. The traffic signal would remain for all other intersection movements. A left-turn lane would be provided as a redundant movement to the flyover ramp for local access to busineses. MD 4 would carry two through lanes in each direction, and MD 235 would maintain three through lanes in each direction. MD 235 would have two left-turn lanes in each direction, and northbound MD 4 would have two left-turn lanes. Northbound MD 235 would have a free-flowing right turn onto northbound MD 4, and northbound MD 4 would have a free-flowing right turn onto southbound MD 235. A bicycle and pedestrian path would be provided through the intersections and connect with the county’s proposed Three Notch Trail.

 
MD 4/MD 235 Intersection Option D - Single Point Urban Interchange
This is a PDF attachment, double click to view:  MD 4/MD 235 Intersection Option D - Single Point Ur

This option is a grade-separated interchange, with MD 4 crossing under MD 235 below ground level. Option D keeps all through traffic on MD 235 flowing (without a traffic signal) with two lanes southbound and three lanes northbound. All left turns would be regulated at a single signalized intersection on the lower level, and would use ramps to get to-and-from each roadway. Through traffic along MD 4 would also cross through the signal, with two through lanes in each direction. Right turns would be made on ramps that do not pass through the signal. A bicycle and pedestrian path would be provided through the intersection and connect with St. Mary’s County’s proposed Three Notch Trail.

 


Hearing Displays
MD 4 Public Hearing Display Boards
This is a PDF attachment, double click to view: MD 4 Public Hearing Display Boards

These boards and maps were on display at the MD 4 Location/Design Public Hearings.

 


 
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Maryland Department of Transportation
707 North Calvert Street Baltimore, Maryland 21202