6/11/2024
WT Staff
 HAPPENING NOW
Tuesday, June 11, 2024
St. Lawrence County moderate drought
June 11, 2024 1011 am EDT
Current Streamflow Situation
Streamflows run mostly normal statewide with isolated instances of much above normal and much below normal flows. The highest flows in NYS remain as reported yesterday, Niagara River - Lake Erie with two stations reporting 95th percentile, a Black River tributary calling in with another 95th percentile value and a Mohawk River tributary reading 91st percentile. Understanding percentile values, of all the flow volume and gauge height measurements taken on June 11 over the period of record, in the case of Ellicott Creek above Williamsville, the last fifty years, the current streamflow is in the high end of all measurements recorded. Only two or three June 11's out of the last fifty years had higher flow volume than we see today. There are no active flood events recorded in the sampling network, and no extreme high flow values.
The lowest flows recorded Tuesday are found in Ramapo River, St. Lawrence River and Long Island Sound watersheds. Drought rating changes overnight include St Lawrence River watershed dropping into moderate hydrologic drought along the Raquette River channel and Lake Ontario minor tributaries west, Lower Genesee River watershed, Upper Hudson and Black River watersheds cleared from the drought map entirely. See the Streamflow Situation report for more details here.
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.
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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