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WT Staff

Friday, June 7, 2024

June 7, 2024 10 am EDT

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

Fifty-four floodings light up the USA network of the USGS Waterwatch Friday, down from sixty-seven yesterday. WT USA is tracking eleven floods in the monitoring network through New York, Ohio, Georgia and Louisiana. As of this report, all eleven active flood sites are located in Louisiana.

Watershed Region 2 Little River breached flood stage near Rochelle around 230 am, this is the eleventh site to light up the flood dashboard in the monitoring network today. Region 1 watershed Bayou Bodcau Lake is running two and a half feet above the basin and still on a steady rise near Shreveport. Caddo Lake continues flooding near Mooringsport, ten inches over and still rising, however the rate of rise is slowing down and looks to be reaching peak level soon. Bayou Dorcheat continues to flood, the level is two and a half feet over flood stage near Springhill and about the same level over downstream near Minden. South into Region 4 watershed, border river Sabine has breached moderate flood stage just before 6 am, currently four feet over near Logansport and rising. Sabine River got up over moderate flood stage near Burkeville around 4 pm yesterday, currently five feet above the channel and leveling off there. Downstream to the monitor near Bon Wier, moderate flood stage was passed yesterday before noon, this location sees 42400 cubic feet per second moving past the monitor running more than four feet over the channel and still increasing, peak flow is yet to be reached. The last monitor on Sabine is near Ruliff, here we see 22000 cubic feet per second passing the sensors and just one foot over. The glut of flood water is on its way to the Gulf, this site will receive double the volume and spill out over the next hours and days even as the citizens of Louisiana have been dropping their flood insurance. THe east side of Region 4 watershed is drained by the Calcasieu River, still flooding two feet over near Glenmora. Flooding near Oberlin ended around the noon hour yesterday. South of LA-190 and over the height of land dividing watershed regions 4 and 5 the Mermentau River signals just a fraction of an inch above flood stage at Mermentau. This location is up and down, will be flooding on an off for the near foreseeable future until the mass of surface runoff exits the landscape into the Gulf. Three additional locations in Regions 1 and 2 along the Texas border are signalling above the 99th percentile, flood stage is not documented for those sites. For more inforfmation 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.

Current Streamflows from the network of USGS river monitors in NYS
New York State has been watered overnight, the rains boosting streamflows through the all four drainage basin turning back a deep drying trend more than a week in the making. The current streamflow dashboard has changed from red and orange of low to below normal rated water bodies to the green and blue of the normal to much above seasonal normal. The highest flows recorded in the state Friday morning include a 90th percentile flow in the Lake Champlain watershed in the northeast basin, a 93rd percentile flow in the Black River watershed and 90th in the Oswego River - Finger Lakes watershed of the northwest basin. Central basin sees a 94th percentile flow in Mohawk River watershed, 93rd and 95th percentile flows in Long Island Sound watershed of the central drainage basin. A 91st percentile flow is recorded in the Allegheny River watershed and a 93rd percentile value is cast from the Susquehanna River watersheds of the south-flowing drainage basin. Two extreme low flows are persisting through the reversal of the drought trend, one on the Raquette system of St Lawrence River watershed, the other at Swan River on Long Island.

Drought Map
As the drought ratings emanate from a 7-day flow trend, we see today the cumulative effect of more than a week of below normal moisture. The drought map has both descended deeper into drought and expanded in total drought-rated surface area overnight. Oswego River-Finger Lakes watershed has fallen into moderate hydrologic drought Friday, the Lake Ontario minor tributaries west section remains at moderate drought as reported here the last couple of days. Lake Ontario minor tribs central section is on at below normal, St. Lawrence River remains below normal along with adjacent Upper Hudson River and Lake Champlain watersheds. In the southwest, Allegheny River watershed is off the drought map at Chautauqua County, still below normal through Cattaraugus, joined by adjacent Genesee River, today rated below normal from the south NYS line all the way to the outlet in Lake Ontario. A chunk of Niagara River - Lake Erie surface area in north Erie and south Niagara Counties has come on at the below normal rating. Moving east, the Susquehanna River watershed is entirely below normal from its headwaters and all area of NYS drained by its southward flow. It will take more than a single day of normal to above normal flows to shift the drought map, more to follow 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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