For the second consecutive week, no lakes are on the alert list for toxic blue-green algae in the state of Nebraska.

State-issued health alerts for toxic blue-green algae were removed two weeks ago for Merritt Reservoir (Cherry County), Bluestem Lake (Lancaster County), and Rockford Lake (Gage County). Lakes that are on health alert must have two consecutive weeks of readings below 20 ppb before the alert is removed.

The state has issued a health alert for toxic blue-green algae at Swan Creek 5A Lake near Tobias in Saline County. This is the first health alert issued for the 2010 season. Weekly sampling has been conducted at 46 public lakes in Nebraska since the beginning of May.

The state has issued a health alert for toxic blue-green algae at Johnson Lake in Gosper County, and an alert continues at Swan Creek Lake 5A near Tobias in Saline County, which was first placed on alert last week.

The state has discontinued a health alert for toxic blue-green algae at Red Willow Reservoir in Gosper County, after the lake had two consecutive weeks of low readings for toxic blue-green algae. This week, there are no health alerts in effect at any of the 46 public lakes that are tested weekly by the state.

The state has issued a health alert for toxic blue-green algae at Merritt Reservoir in Cherry County. This is the only health alert currently in effect in the state, based on weekly sampling of 46 public lakes across Nebraska.

Samples taken earlier this week at Merritt Reservoir were above the state’s health alert threshold of 20 parts per billion (ppb) of total Microcystins (a toxin released by certain strains of blue-green algae.) Lakes that are on health alert must have two consecutive weeks of readings below the threshold before the alert is discontinued.

The state has issued health alerts for toxic blue-green algae at Kirkman’s Cove near Humboldt and Red Willow Lake near McCook. An alert continues at Merritt Reservoir in Cherry County, which first went on alert last week.

Samples taken earlier this week at the three lakes were above the state’s health alert threshold of 20 parts per billion (ppb) of total Microcystins (a toxin released by certain strains of blue-green algae.) Lakes that are on health alert must have two consecutive weeks of readings below the threshold before the alert is discontinued.

The state has issued a health alert for toxic blue-green algae at Willow Creek Lake near Pierce. Alerts continue for Kirkman’s Cove near Humboldt, Red Willow Reservoir near McCook and Merritt Reservoir in Cherry County.

Health alerts will continue over the Labor Day weekend for Willow Creek Lake near Pierce and Red Willow Reservoir near McCook. Alerts have ended at Kirkman’s Cove near Humboldt and Merritt Reservoir in Cherry County.

The state has issued a health alert for toxic blue-green algae at Swan Creek Lake 5A near Tobias. Alerts continue for Willow Creek Lake near Pierce and Red Willow Reservoir near McCook.

The state has issued a health alert for toxic blue-green algae at Merritt Reservoir in Cherry County and Kirkman’s Cove near Humboldt. Alerts continue for Swan Creek Lake 5A near Tobias, Willow Creek Lake near Pierce and Red Willow Reservoir near McCook.