Maryland Route 100 (MD 100) is a major east–west highway connecting U.S. Route 29 (US 29) in Ellicott City (just north of

Columbia Columbia may refer to: * Columbia (personification), the historical female national personification of the United States, and a poetic name for America Places North America Natural features * Columbia Plateau, a geologic and geographic region i ...

) and MD 177 (Mountain Road) in Pasadena. MD 100 also connects to

Interstate 95 Interstate 95 (I-95) is the main north–south Interstate Highway on the East Coast of the United States, running from US Route 1 (US 1) in Miami, Florida, to the Houlton–Woodstock Border Crossing between Maine and the Canadia ...

(I-95), US 1, the Baltimore–Washington Parkway (MD 295), and I-97. The highway connects Howard County to the west with Anne Arundel County and the

Chesapeake Bay The Chesapeake Bay ( ) is the largest estuary in the United States. The Bay is located in the Mid-Atlantic region and is primarily separated from the Atlantic Ocean by the Delmarva Peninsula (including the parts: the Eastern Shore of Maryland / ...

to the east. MD 100 also provides access to the

Baltimore–Washington International Airport Baltimore/Washington International Thurgood Marshall Airport , commonly referred to as BWI or BWI Marshall, is an international airport in the Eastern United States serving mainly Baltimore, Maryland and Washington, D.C. With Dulles Internat ...

(BWI) and the Arundel Mills shopping mall. The eastern section of MD 100 in Anne Arundel County is known as the Paul T. Pitcher Memorial Highway. The name comes in dedication to Paul T. Pitcher, an Anne Arundel County executive, who originally conceived the highway.

Route description

The route begins as a six-lane divided

freeway A controlled-access highway is a type of highway that has been designed for high-speed vehicular traffic, with all traffic flow—ingress and egress—regulated. Common English terms are freeway, motorway and expressway. Other similar terms ...

at US 29 near Ellicott City. There are then interchanges with MD 108, MD 104, Snowden River Parkway and MD 103. At the junction with I-95, the road narrows to four lanes. Then MD 100 intersects with US 1 followed by an exit for the Dorsey station along

MARC Marc or MARC may refer to: People * Marc (given name), people with the first name * Marc (surname), people with the family name Acronyms * MARC standards, a data format used for library cataloging, * MARC Train, a regional commuter rail system of ...

Camden Line The Camden Line is a MARC commuter rail line that runs for between Union Station, Washington, D.C., and Camden Station, Baltimore, Maryland, over the CSX Capital Subdivision, and Baltimore Terminal Subdivision. It is one of the oldest commuter ...

. It then crosses the Baltimore-Washington Parkway. MD 100 then intersects with MD 170 (Telegraph Road) where the road becomes 6 lanes. Then the road junctions with Interstate 97 near

Hanover Hanover (; german: Hannover ; nds, Hannober) is the capital and largest city of the German state of Lower Saxony. Its 535,932 (2021) inhabitants make it the 13th-largest city in Germany as well as the fourth-largest city in Northern Germany ...

and reduces down to 4 lanes before crossing MD 2. Between Glen Burnie and Jacobsville, MD 100 serves as a bypass for MD 177, and has interchanges with MD 10 and MD 607. The road ends by merging back into MD 177.

History

Maryland Route 100 began in the 1970s as two separate roads, both having the MD 100 designation. The first was known as the Mountain Road Extension, stretching between Governor Ritchie Highway and the old Maryland Route 3, now Interstate 97. The second was built as a short spur between the newly constructed

and US 1 in

Elkridge, Maryland Elkridge is an unincorporated community and census-designated place (CDP) in Howard County, Maryland, United States. The population was 15,593 at the 2010 census. Founded early in the 18th century, Elkridge is adjacent to two other counties, A ...

. The eastern section, originally known as the Mountain Road Bypass, was constructed east of Ritchie Highway in the late 1970s. MD 100 was completed west of I-97 to I-95, thereby connecting the two roads, in 1994, but it was not completed in its entirety to US 29 until November 1998. A portion of the route between Exit 1B-C and Exit 2 was constructed earlier than the rest as an at-grade boulevard, on the right-of-way of the future eastbound lanes; this section was eventually upgraded. The construction of the route near Lake Waterford Road severed the original road between

Baltimore Baltimore ( , locally: or ) is the most populous city in the U.S. state of Maryland, fourth most populous city in the Mid-Atlantic, and the 30th most populous city in the United States with a population of 585,708 in 2020. Baltimore was ...

and

Annapolis Annapolis ( ) is the capital city of the U.S. state of Maryland and the county seat of, and only incorporated city in, Anne Arundel County. Situated on the Chesapeake Bay at the mouth of the Severn River, south of Baltimore and about east ...

: the Baltimore-Annapolis Boulevard, signed in part as

MD 648 Maryland Route 648 (MD 648) is a collection of state highways in the U.S. state of Maryland. These nine highways are current or former sections of the Baltimore–Annapolis Boulevard between Annapolis and Baltimore via Glen Burnie. There are ...

. The physical road ends at a pair of dead ends on either side of the right-of-way; MD 648 follows Lake Waterford Road between Baltimore-Annapolis Boulevard and MD 177 before rejoining its original path. The route was to be part of the

Baltimore Outer Beltway The Baltimore Outer Beltway was a proposed freeway that would encircle parts of the Greater Baltimore area. Parts of it have been built as the following roads: *Maryland Route 100 (22.1 miles) *US 29 (4 miles) *Maryland Route 43 Maryland Route ...

, a proposed freeway that would have encircled parts of the Greater Baltimore area and provide a route parallel to the

Baltimore Beltway Baltimore ( , locally: or ) is the List of municipalities in Maryland, most populous city in the U.S. state of Maryland, fourth most populous city in the Mid-Atlantic (United States), Mid-Atlantic, and List of United States cities by popula ...

. MD 100 represents the major portion that was built; US 29 between MD 100's terminus and US 29's own northern terminus at

Maryland Route 99 Maryland Route 99 (MD 99) is a state highway in the U.S. state of Maryland. Known as Old Frederick Road, the state highway runs from MD 32 near West Friendship east to U.S. Route 29 (US 29) in Ellicott City. MD 99 parallels the north side of ...

, four miles (6 km) in length, is another portion. The Outer Beltway was projected beyond MD 99 to run through

Howard Howard is an English-language given name originating from Old French Huard (or Houard) from a Germanic source similar to Old High German ''*Hugihard'' "heart-brave", or ''*Hoh-ward'', literally "high defender; chief guardian". It is also probabl ...

and

Counties and intersect MD 140,

Interstate 83 Interstate 83 (I-83) is an Interstate Highway in the Eastern United States. Its southern terminus is at a signalized intersection with Fayette Street in Baltimore, Maryland; its northern terminus is at I-81 near Harrisburg, Pennsylvania. Mo ...

, US 1, and

before terminating at

US 40 U.S. Route 40 or U.S. Highway 40 (US 40), also known as the Main Street of America, is a major east–west United States Highway traveling across the United States from the Mountain States to the Mid-Atlantic States. As with most routes ...

northeast of

Exit list

Auxiliary routes

MD 100 has fourteen auxiliary routes: five in Howard County, eight in Anne Arundel County, and one in both counties. *MD 100-J is a segment of Long Gate Parkway from Meadowbrook Lane and a

park and ride A park and ride, also known as incentive parking or a commuter lot, is a parking lot with public transport connections that allows commuters and other people heading to city centres to leave their vehicles and transfer to a bus, rail system ( ...

exit through MD 100's exit 1A to the end of state maintenance where the road continues as Long Gate Parkway. It is located in Ellicott City, Howard County. *MD 100-L is the designation for a section of the access road from the Dorsey MARC station to MD 100 at exit 7 in Dorsey, Howard County. *MD 100-M is the designation for a segment of Coca-Cola Drive from MD 103 to Park Circle Drive in both Howard and Anne Arundel Counties. The route has an interchange with MD 100 at its exit 8. *MD 100-N is a state-maintained segment of Wright Road in Hanover, Anne Arundel County. The road was realigned as a result of the construction of MD 100's exit 9. *MD 100-O is a segment of old Wright Road in Hanover, Anne Arundel County. The route runs from MD 100-N to a point just before Old Wright Road dead ends. *MD 100-P is a state-maintained section of Harmans Road over MD 100 in Harmans, Anne Arundel County. It is long. *MD 100-Q is a section of Queenstown Road over MD 100 in Severn, Anne Arundel County. *MD 100-R consists of a segment of WB&A Road over MD 100 in Severn, Anne Arundel County. *MD 100-S is a section of Wieker Road from MD 170 (near MD 100's exit 11) to an intersection with Wieker Road and South Wiker Road in Severn, Anne Arundel County. *MD 100-T is a paved and state-maintained section of Sandy Farm Road in Severn, Anne Arundel County. The route begins at an intersection with MD 100-S and travels north, adjacent to MD 170 and the ramps of MD 100 exit 11. It ends at the transition from a narrow paved road to a dirt road. *MD 100-U is the easternmost segment of Otis Drive in Severn, Anne Arundel County. The route is long and runs parallel to MD 170 in the vicinity of MD 100's exit 11. *MD 100-V is a short segment of Executive Park Drive from the MD 100 eastbound exit 1B offramp to the access road in MD 100's median. The route is in Ellicott City, Howard County. *MD 100-W is the designation for a segment of Snowden River Parkway in Columbia, Howard County. It runs from the intersection of MD 108 (Waterloo Road) and Snowden River Parkway to a roundabout for the MD 100 eastbound ramps at exit 3. *MD 100-X is the designation for an unnamed road in Elkridge, Anne Arundel County. The route begins at the intersection of US 1 and Amberton Drive and travels north for before ending at a private driveway.

References

External links