Interstate 370 Maryland
Interstate 370 connects I-270 with the Intercounty Connector (ICC) toll road east in Montgomery County, Maryland. Located between the cities of Gaithersburg and Rockville, I-370 carries commuter traffic west to Sam Eig Highway and east to Shady Grove Metro Station. Prior to construction of the ICC, I-370 concluded at the exchange with Shady Grove Road and the access road to Shady Grove Station. Inventoried as Maryland 200A, this connection remains but is no longer included in the Interstate System.
Designated Maryland State Route 200, the Intercounty Connector extends east from a trumpet interchange with Interstate 370 and Maryland 200A. The 18.8-mile long toll road winds through suburban areas north of the Capital Beltway to Interstate 95 and U.S. 1 near Laurel. Operated by the Maryland Transportation Authority (MDTA), the expressway uses all electronic toll (AET) collection.
AASHTO approved Interstate 370 between I-270 and the vicinity of Shady Grove on November 15, 1975. The freeway opened to traffic on December 17, 1988.1 Completion of the Intercounty Connector Project shortened I-370 from 3.13 to 2.54 miles. The truncation to Maryland 200 was conditionally approved by AASHTO on November 16, 2012.
East End – Washington Grove, MD
West End – Gaithersburg, MD
Mileage – 2.54
Cities – Gaithersburg, Rockville
- Junctions –
Source: December 31, 2018 Interstate Route Log and Finders List
I-370 Annual Average Daily Traffic (AADT)
|Location||Vehicles per day|
|MD 119 to I-370||35,921|
|I-270 to MD 355||98,390|
|MD 355 to MD 200||88,670|
A Draft Environmental Impact Statement (DEIS) was released for the Intercounty Connector project in December 2004, with a toll feasibility analysis completed afterwards.2 The preferred corridor was the southern alignment.3 A Record of Decision was released by the Federal Highway Administration (FHWA) on May 30, 2006.4
Construction on the ICC began in November 2007 after nearly 50 years of debate on whether to build it.5 The ICC is not planned to be designated as a part of Interstate 370.6 Plans called for the six-lane, $2.4 billion tollway to fully open in 2012. The phases for construction were:7
- Contract A – connect Interstate 370 and MD 97 / Georgia Avenue (7.2 miles, construction from 11/13/07 to Fall 2010; $478.7 million cost)
- Contract B – connect MD 97 / Georgia Avenue with U.S. 29 (7.0 miles, construction from Mid-2008 to Late 2011; up to $460 million cost)
- Contract C – connect U.S. 29 with I-95 (3.7 miles, construction from 1/14/08 to Late 2011, $513.9 million)
- Contract D – construct collector distributor roadway system between ICC and I-95 (three miles at a cost up to $75 million) – construction slated from 2010 to 2011 or 2012
The ICC fully opened between I-370 and I-95 on November 22, 2011. The 1.5 mile extension from I-95 east to U.S. 1 at Laurel opened to traffic on November 10, 2014.
East End Inner County Connector – Washington Grove, Maryland
West End / Sam Eig Highway – Gaithersburg, Maryland
- Interstate 370 @ Wikipedia.org.
- “Maryland’s ICC may not need any tax money – for Maryland Taxpayers Association.quot; Toll Road News, March 24, 2005.
- “Southern Route for Connector Endorsed” Washington Post, February 4, 2005.
- Posts from misc.transport.road newsgroup: “Maryland ICC Record of Decision and Groundbreaking” by Scott M. Kozel, 05/31/06 and “Re: Maryland ICC Record of Decision and Groundbreaking” by Scott M. Kozel, 05/31/06.
- “With Obstacles Overcome, Highway Work Begins: Quietly, Barriers and Dirt Emerge at Scattered Sites.” Washington Post, November 29, 2007.
- Wolf, Joe. “Another Interstate Guide update.quot; Personal Email, 12/17/07.
- ICC Project Schedule
http://www.iccproject.com/project-schedule.php, accessed on January 2008.
Page updated February 20, 2019.