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    Harmful Algal Blooms (HAB)

    Lahontan Reservoir upgraded to a HAB WARNING Advisory

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HAB Advisory

Harmful Algal Blooms

This page will be updated with information on current Harmful Algal Bloom sites within Nevada State Parks. For a full list of HAB sites in Nevada, go here. Learn more about HABs by visiting the NDEP page, here

Rye Patch State Recreation Area (Updated October 8, 2025)

Rye Patch Reservoir, located in Rye Patch State Recreation Area, has been placed under a HAB Watch Advisory due to a possible Harmful Algae Bloom. Visual assessments have indicated a possible bloom. Water tests are currently being conducted by the Nevada Division of Environmental Protection (NDEP). These toxic algae can cause serious health issues for humans and animals.

Wild Horse State Recreation Area (Updated October 8, 2025)

Wild Horse Reservoir, located in Wild Horse State Recreation Area, has been placed under a HAB Watch Advisory due to a possible Harmful Algae Bloom. Visual assessments have indicated a possible bloom. Water tests are currently being conducted by the Nevada Division of Environmental Protection (NDEP). These toxic algae can cause serious health issues for humans and animals.

Lahontan State Recreation Area (Updated: October 8, 2025)

Lahontan Reservoir, located in Lahontan State Recreation Area, has been upgraded to a HAB WARNING Advisory. Visual and satellite imagery assessments have indicated an increase presence of Cyanobacteria. Water tests are currently being conducted by the Nevada Division of Environmental Protection (NDEP). These toxic algae can cause serious health issues for humans and animals.

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