Howard Secures $75M Federal Loan for Major Flood Mitigation Project

Howard County secures $75 million low-interest federal loan to support flood mitigation project.

Howard County Executive Calvin Ball announced the closing of a $75 million low-interest federal loan to construct a 5,000-foot-long tunnel in Ellicott City, the largest and most impactful flood mitigation component of the Ellicott City Safe and Sound plan.

“This tunnel will be one of the most important and impactful public works projects in the history of Howard County,” said County Executive Calvin Ball. “This game-changing project will carry 26,000 gallons of stormwater per second, away from streets and foundations in Old Ellicott City and the West End and directly into the Patapsco River – about the amount of water in an in-ground pool every second. We are writing a new chapter in the long history of Ellicott City, making it a national model of resilience.”

The funding comes from the Environmental Protection Agency’s (EPA) competitive Water Infrastructure Finance and Innovation Act (WIFIA), which provides water project construction funding under favorable terms. The EPA funding brings the total investment of county, state, and federal dollars in Ellicott City to $167 million in the past four years.

According to a County press release:

County public works officials said they expect to complete design of the tunnel this year, with construction starting as soon as possible. The project, known as the Extended North Tunnel, will be about 18 feet in diameter and run up to 100-feet underground, just north of Main Street. Howard County has already broken ground on two other major flood mitigation projects – the H7 and Quaker Mill ponds. Both projects are expected to be completed in the next year and will retain nearly 7.5 million gallons of storm water combined – about the size of a football field covered by 23 feet of water.

Components of the Ellicott City Safe and Sound Plan, which can be found at, also include:

  • Seven major water retention and water conveyance projects, including the tunnel and the ponds being constructed
  • Enhanced stream cleaning
  • Tone alert warning system and signage
  • Drainage improvements throughout the watershed

Read more about the Ellicott City Safe and Sound Plan.