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Hydrology of Mosquito Lagoon Quick Topics

Mosquito Lagoon receives freshwater inputs from precipitation, surface runoff, groundwater seepage, a few tributaries, man-made canals and wastewater treatment plants. Surface runoff is the predominant fresh water drainage input into Mosquito Lagoon. Few natural streams contribute fresh water to the system. Several manmade drainage ditches extend the natural watershed to the west and there are a few natural creeks that discharge into the lagoon. There are two large culverted canals in the City of Edgewater that drain into Mosquito Lagoon: the Gabordy Canal (10th Street) and the 18th Street Canal. Mosquito Lagoon's drainage basin is small. The surface drainage basin consists of 42,000 acres and is located entirely within Brevard and Volusia counties extending from Ponce de Leon Inlet to the southernmost extent of Mosquito Lagoon.

Since humans first inhabited Florida, they have substantially altered the hydrology of the region. These projects have substantially changed the topography and physical features of the lagoon, including infiltration, runoff, shallow-aquifer storage and land drainage capacities. Long-term efforts throughout the Mosquito Lagoon basin by Volusia County and St. Johns River Water Management District to reconnect mosquito impoundments with culverts or removing dikes to allow tidal exchange have almost been completed. Progress on restoring natural functions to dragline-ditched wetlands is underway.

Rotary ditch

Major hydrologic alterations include:

  • The Atlantic Intracoastal Waterway.
  • Haulover Canal.
  • Mosquito impoundments.


  • Residental navigation and drainage canals.
  • Causeways.
  • Lands created by dredge and fill activities.

Mosquito Lagoon contains approximately 20,000 acres of salt marsh wetlands including over 6,750 acres that were impounded to control salt-marsh mosquito populations. The restoration of approximately 1,300 acres of dragline-impacted wetlands throughout Mosquito Lagoon is an ongoing project in partnership with the St. Johns River Water Management District, Volusia County Mosquito Control, CNS, MINWR and CAMA. The C-8 impoundment is the first permitted project located within MLAP to be restored to historic marsh elevations. The University of Central Florida is currently collecting data on the re-vegetation of the restored marshes by utilizing plant species such as glasswort, saltwort and mangroves.









Last updated: April 06, 2015

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