Tenmile Creek (Maryland)
The headwaters of the stream originate in Thompsons Corner area of the county, about 2 miles (3.2 km) northwest of Clarksburg, and the creek flows south for about 2.5 miles (4.0 km), to Little Seneca Lake, a reservoir built on Little Seneca Creek. Little Seneca Creek drains to the Potomac River and the Chesapeake Bay.
Water quality and land use issue
The Tenmile Creek watershed is described as one of the highest quality stream systems in Montgomery County, according to government studies. It is a drinking water source as part of the Little Seneca system, an emergency water supply for the metropolitan Washington, D.C. area. The creek main stem is extensively forested and the watershed contains some agricultural land. However, the basin is bisected by an interstate highway, I-270, and additional land development is planned for the Clarksburg area.
In 1994 the county government had designated a portion of the watershed as a "special protection area" (SPA) to protect water quality by requiring builders to install extensive controls for stormwater runoff. A follow-up study found that after construction of several projects, water quality in the Little Seneca basin was degraded, despite the SPA requirements. In April 2014, the Montgomery County Council set additional limits on development projects in order to protect the quality of the creek and adjacent habitat. Later that year, developers filed suit against the county, claiming that the county "illegally limited construction on its property."  The U.S. District Court in Maryland dismissed the suit in August 2017. The district court's dismissal was affirmed by the Fourth Circuit Court of Appeals on November 29, 2018.
- U.S. Geological Survey Geographic Names Information System: Tenmile Creek (Maryland)
- Montgomery Department of Environmental Protection (MCDEP), Rockville, MD. "Watershed Health: Tenmile Creek." Accessed 2014-03-22.
- MCDEP (November 2003). Ten-Year Comprehensive Water Supply and Sewerage Systems Plan; 2003-2012 (PDF) (Report). pp. 3–6.
- "Clarksburg Master Plan & Hyattstown Special Study Area". Silver Spring, MD: Montgomery County Planning Board. June 1994.
- "Little Seneca Creek Subwatershed". Department of Environmental Protection (MCDEP). Rockville, MD: Montgomery County, Maryland. Retrieved 2016-11-24.
- MCDEP (January 2010). Special Protection Area Program Annual Report 2008 (PDF) (Report). AR-SPA-08.
- "Approval of Planning Board Draft 10 Mile Creek Area Limited Amendment to the Clarksburg Master Plan and Hyattstown Special Study Area" (PDF). Rockville, MD: Montgomery County Council. 2014-04-01. Resolution No. 17-1048.
- Turque, Bill (2014-04-02). "Montgomery council brings official end to battle over Clarksburg's Ten Mile Creek". Washington Post.
- Turque, Bill (2014-11-14). "Clarksburg builders file suit, charging that MoCo improperly limited home construction". Washington Post.
- Pulte Home Corp. and Shiloh Farm Investments v. Montgomery County, Maryland (D. Md. 2017-08-25). Text Case No. GJH-14-3955.
- Pulte Home Corp. and Shiloh Farm Investments v. Montgomery County, Maryland (4th Cir. 2018-11-29). Text. Docket no. 17-2112.
- Detailed environmental studies of the Tenmile Creek area - Montgomery County Planning Board
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