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WT Staff

Tuesday, June 11, 2024

June 11, 2024 705 am EDT

Current Streamflow Situation
USGS Waterwatch has the Lake Erie basin streamflow gauges back on line, the levels of rated monitoring stations run mostly normal statewide Tuesday. Three stations signal below normal on the Lake Erie side of the state height-of-land divide Tuesday, one of these is rated much below normal, 3rd percentile flow on the Cuyahoga River at Newburgh Heights. Three stations are below normal in the Scioto basin, three below normal in Muskingum River basin, four below normal in the Ohio River minor tributaries. The highest flow Tuesday is 77th percentile, found in the upper Mad River channel of the Great Miami River basin. As of this report, there are no active floodings, extreme high or extreme low flows.

WT USA Flows and Flood Tracker provisional data from the network of USGS streamflow monitors

Fifty-three flood events are recorded on the USGS network Tuesday morning, down from sixty-seven yesterday. WT USA tracks reference flood events through our coverage area in New York, Ohio, Georgia and Louisiana. At the writing of this report, all active flood sites are located in Louisiana.

Louisiana: Four flood events have ended since our initial report this morning. Red River breached flood stage yesterday at Coushatta, the county seat of Red River Parish. As of this report, provisional data show Red River back inside the channel and receding. Region 7 Pearl River is no longer flooding near Bogalusa, this reference incident was over around 8 am EDT this morning. Around the same time, two more sites stopped flooding, Bayou Dorcheat in Region 1 is back in the channel near Minden, and Region 4 Calcasieu River is no longer flooding near Oberlin. Ten sites continue to flood in the monitoring network of USGS Louisiana.

Northwest LA, Region 1 watershed continues with monitored flood incidents at Caddo Lake, Bayou Bodcau Lake, Bayou Dorcheat flooding near Springhill. Region 2 Little River is up in the last twenty four hours, nine inches above the channel near Rochelle. Region 4 west border Sabine River is still flooding near Logansport, Burkeville, Bon Wier and Ruliff. The east side of Region 4 watershed Calcasieu River is running a foot and a half over near Glenmora. Twelvemile Bayou is still running above 99th percentile near Dixie with no flood stage to reference. Sabine River is recorded above 99th percentile at Toledo Bend Reservoir near Burkeville with no flood stage documented. For more information on the flood trend in Louisiana, see black tags indicating flood flow volume and gauge height, blue tags for 99th percentile flows, updated daily here.

HABS Tracker - Public Beach Advisories
Four Recreational Public Health Advisories for algal toxin appear in the public notifications Tuesday, all on Grand Lake. Grand Lake is a source of raw drinking water for the City of Celina. Mandatory testing of surface sourced drinking water supplies for algal toxin microcystins started the first full week of June with the first test results posted to the public for the period June 2 - 8. Results posted for Grand Lake 13.2 micrograms per liter exceed action level for sensitive persons and for the general population. The action level for children under 6 years old, pregnant women, nursing mothers, those receiving dialysis treatment and those with pre-existing liver conditions is 0.3 ug/L. 1.6 ug/L is the action level for the general population, Grand Lake tests 44 times higher for sensitive population and 8.5 times above action level for the general population.

Testing for drinking water and recreational water are undertaken by different state departments. WTOH.us posts both categories of results here. Twenty-one recreational public health advisories are active Tuesday morning for high bacteria levels on public beaches. See the HAB Tracker report here for details, updates are in progress.

Nineteen Lake Erie beaches on the Recreational Public Health Advisory list Monday, updates in progress, more to follow.

As many drinking water facilities are supplied from surface water reservoirs, the streamflow situation is pertinent to both drinking water supply and quality. High flows can stir up sediment and cause turbidity in the reservoirs, requiring additional treatments to render the water potable. Low flow volume is linked to warmer temperatures in the reservoir and can be an issue for water quality where HABs are present. WT tracks streamflow trends with an eye to the impacts on drinking water supply and quality in each of the state's watersheds. Check the watershed layer on the map to see the direction of flow and streamflows that may be impacting drinking water today.

USGS Provisional Data Statement
Data are provisional and subject to revision until they have been thoroughly reviewed and received final approval. Current condition data relayed by satellite or other telemetry are automatically screened to not display improbable values until they can be verified.
Provisional data may be inaccurate due to instrument malfunctions or physical changes at the measurement site. Subsequent review based on field inspections and measurements may result in significant revisions to the data.
Data users are cautioned to consider carefully the provisional nature of the information before using it for decisions that concern personal or public safety or the conduct of business that involves substantial monetary or operational consequences. Information concerning the accuracy and appropriate uses of these data or concerning other hydrologic data may be obtained from the USGS.

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