Seneca Creek Greenway Trail. Photo by Vicki’s Pics on Flickr.

M-83, also known as Midcounty Highway Extended, is an environmental calamity that will cost hundreds of millions. Yet Montgomery County continues to pursue its construction. Will county leaders consider a transit alternative to a new highway?

When Montgomery County planners put M-83 on the master plan of highways in the early 1960s, the county’s population was 340,000. DC’s streetcars had recently gone away. And highways were the future of transportation.  Today, the county population is one million, DC is about to bring back the streetcar, and highway removal is common. But M-83, the county’s zombie highway, is still around.


This Thursday, the Planning Board will review alternatives for the proposed highway between Gaithersburg and Clarksburg.  But planning staff recommends that they ask the Montgomery County Department of Transportation (MCDOT) to study a transit alternative as well, and remove the alternative with the most property takings.



Highway laid out according to 1960s standards

Midcounty Highway was supposed to be an 8.7-mile, limited access, four to six lane highway east of Route 355, connecting the planned corridor cities of Gaithersburg, Germantown, and Clarksburg. The county has built the southern end, a 3-mile divided highway between Shady Grove Road and Montgomery Village Avenue in Gaithersburg. And developers recently built the northern end, called Snowden Farm Parkway, in Clarksburg.

The Planning Board last reviewed the remaining middle part of M-83 in 1992, but for over a decade, not much happened due to a lack of money. In 2003, MCDOT began to study building the rest of M-83 along the master plan route. But that route dates from before the National Environmental Policy Act of 1969 (NEPA), when planners thought it was a good idea to put highways in stream valleys.

So the Army Corps of Engineers, the Environmental Protection Agency (EPA), and the Maryland Department of the Environment (MDE) got involved. And MCDOT had to follow NEPA’s requirement to identify alternatives and evaluate the environmental effects.

In May 2013, MCDOT issued its draft report on the environmental effects. The Army Corps of Engineers and MDE then held a public hearing in August about MCDOT’s application for a permit to build M-83. They have yet to publish their findings.

Planning staff recommend studying a transit alternative

But this week, the Planning Board will nonetheless review the master plan route and its alternatives. In a report issued last week, planning staff say that MCDOT should evaluate a transit alternative, including the planned bus rapid transit (BRT) route along 355, and that MCDOT’s transportation systems management/transportation demand management (TSM/TDM) alternative should also include BRT along 355.

Their analysis suggests that the area can meet its transportation needs through 2040 without M-83. They also note that the 355 BRT corridor would have the second-highest daily ridership of the 10 proposed transit corridors in the Countywide Transit Corridors Functional Master Plan.

MCDOT says they didn’t look at a transit alternative because Montgomery County has not adopted any plans for BRT. They also did not consider transit in their TSM/TDM alternative, even though TSM/TDM usually includes transit.

The staff report’s recommendation will please M-83’s opponents, including Transit Alternatives to Mid-County Highway Extended (TAME) and the Action Committee for Transit, who have been calling for years for MCDOT to study a transit alternative.

County planners also recommend asking MCDOT to eliminate the alternative route through Goshen, which would involve widening existing two- and four-lane roads. The Planning Board already recommended eliminating the route in 1992. Some community groups have strongly opposed this alternative in favor of the master plan route so that M-83 wouldn’t go through their neighborhoods. If the threat from this alternative route goes away, some of the support for M-83 along the master plan route will probably go away as well.

MCDOT’s report underestimates environmental and property impacts

In addition, the staff report points out problems with MCDOT’s evaluation of environmental effects. For example, MCDOT reports that if M-83 isn’t built, 16 intersections will exceed traffic congestion standards. But the staff report notes that at least 6 of these intersections are south of M-83 and would also exceed the standard under all of the alternative routes, including the master plan route.

Similarly, MCDOT’s traffic modeling estimates a 55% reduction in travel time for the master plan route and a 37% reduction for Alternative 5, compared to not doing anything at all. (Alternative 5 proposes widening Route 355 and adding service roads.) The staff report notes that the 37% reduction represents a trip that is 3 minutes shorter.

The staff report also points out that MCDOT used a roadway width of less than 150 feet to estimate how many properties each alternative route would disturb or displace. However, 150 feet is the standard roadway width in the current county road code. In addition, MCDOT did not estimate how many properties stormwater management and noise abatement measures might affect. Thus, MCDOT’s estimates of the number of affected properties are probably too low.

As for the cost of building M-83, MCDOT estimates for the build alternatives range from $41 million for the TSM/TDM alternative to $357 million for the master plan route. But these estimates are probably too low as well.

According to the staff report, MCDOT’s estimates of environmental impacts do not account for stormwater management and the effects of retaining walls. For example, the master plan route would require a retaining wall 400 feet long along Great Seneca Creek, most of which would be in the flood plain within 20-30 feet of the stream channel.

Along Whetstone Run, the master plan route would have to be built on fill, with a retaining wall next to the stream channel. And while the smaller stream reaches may not have delineated flood plains, they have wetlands that function much like flood plains.

What’s more, much of the master plan route goes through parkland, including Great Seneca Creek Park and the North Germantown Greenway Stream Valley Park. According to the staff report, the master plan route would have “calamitous” effects on 3 of the largest biodiversity areas in the county, far beyond the official limits of disturbance. And the staff report recommends mitigating impacts on parkland through a combination of trails, environmental projects, and replacement of parkland with land of equal or greater value.

So how much would it cost to build M-83, including parkland mitigation and the environmental requirements of building across streams and along stream valleys? Presumably more than MCDOT estimates.

For now, asking MCDOT to evaluate a transit alternative is a good idea, and so is repeating the Planning Board’s 20-year-old request to remove the alternative route through Goshen. But ultimately, it’s time for Montgomery County to say no at last to this environment-destroying, obsolete, expensive highway.

Perhaps in the early 1960s, transportation meant moving cars, and the environment was supposed to make way for progress. But it’s 2013. Shouldn’t we know better by now?

The Planning Board will review the alternatives for Midcounty Highway in Silver Spring on Thursday, November 21, beginning at 6 pm. If you want the Planning Board review to include your thoughts about this project, you can send written comments by e-mail through Wednesday.