Montgomery County Flood Sensors

What is the Flood Sensor Project?

The Flood Sensor Partnership is a cooperative effort among County agencies responsible for various aspects of Public Safety, Storm Event Preparedness and Response, and Emergency Management, along with the federal Department of Homeland Security (DHS) to install 35 next generation IoT flood sensors in flood-prone areas of the County. The flood sensors are manufactured by Intellisense, and detect rising flood water levels during storm events to send early flood warnings to officials based on real-time monitoring.

View and Download the Flood Sensor Fact Sheet (PDF)


The Flood Sensors deployed in the County through this project have been developed by the DHS Science and Technology Directorate with scientists, equipment manufacturers, and stormwater management programs around the US to develop scalable, low-cost flood-sensor networks in response to changing climate conditions that are resulting in more frequent and higher intensity storm events. Urban and riverine flooding is a growing issue in Maryland. The increasing number of extreme rainfall events that produce intense precipitation will continue to lead to more urban and riverine flooding events, with increasing demands on public safety programs to mitigate their impacts. The 2017 National Climate Assessment indicates that “heavy downpours are increasing nationally, especially over the last three to five decades. The largest increases are in the Midwest and Northeast, including the Mid-Atlantic.

The flood sensors are low-maintenance and DHS is providing all 35 flood sensors at no cost to the County under a Cooperative Research and Development Agreement (CRADA). The County is responsible for installation and maintenance of the sensors, analyzing data accuracy, and piloting local usage such as long-term operations and procedures.

What do the Flood Sensors Do?

The flood sensors automatically detect rising water levels and focus specifically on providing early warnings about high water levels or flooding. They will promote community resilience and prepare communities to respond by providing alerts, warnings, and notifications of flooding, protecting critical infrastructure, and reducing property losses.

Where Are the Flood Sensors Deployed?

The flood sensors are deployed starting June 2022 at 35 sites identified by DEP and OEMHS, including 14 high or significant hazard dams and 21 low-lying roads and floodprone areas. These real-time sensors complement and extend the capabilities of the County’s existing operations that include DEPs remote monitoring stations that are part of existing Dam Safety Operations, and OEMHSs tracking and monitoring of water levels at streams and rivers across the County through the existing US Geological Survey (USGS) gauges.

Flood Sensors in Montgomery County

View Flood Sensor Locations on Google Maps

View and Download the  Flood Sensors Location Map (PDF)

  • 16500 Black Rock Rd*
  • 17830 Edwards Ferry Rd*
  • 20499 Martinsburg Rd*
  • 2358 Baltimore Rd*
  • 26020 Long Corner Rd*
  • 4146 Brookeville Rd*
  • 5410 Griffith Rd*
  • 8900 Block Gue Rd
  • Beach Dr & E Stanhope Rd*
  • Beach Dr & Wyndale Ave
  • Burnt Mills at US 29
  • Cabin John Creek at Bradley Blvd
  • Christie Estates Regional
  • Davis Mill Rd & Huntmaster Rd
  • Davis Mill Rd & Wildcat Rd
  • Environ HOA
  • Falls Rd Dam
  • Great Seneca Creek at Brink Rd
  • Great Seneca Creek at Game Preserve Rd
  • Gunners Lake Dam
  • Hawlings River at Brighton Dam Rd
  • Hawlings River at Zion Rd
  • Inspiration Lake
  • Lake Hallowell
  • Lake Nirvana
  • Lake Placid
  • Lake Whetstone Dam
  • Little Seneca Creek at Newcut Rd
  • Loghouse Rd at Macgruder Branch*
  • Olney Oaks
  • Pine Lake Dam
  • Pueblo
  • Rattlewood Dam
  • Reddy Branch at Brookeville Rd
  • Rock Creek at Knowles Ave
  • Rock Creek Woods Apartments
  • Sligo Creek at Houston Ave
  • Sligo Creek at New Hampshire Ave
  • Sligo Creek at Schuyler Rd
  • University Blvd Pond
  • Vineyard
  • W Old Baltimore Rd & 10 Mile Creek Rd*
  • Wheaton Dam
  • Wheaton Dam Downstream
* Future Site