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WT Staff

Sunday May 19, 2024
Above normal streamflows in in the west

May 19, 2024 1018 am EDT

Current Streamflow Situation
Northwest NYS is seeing above normal to much above normal streamflows Sunday through the Genesee River and Lake Ontario minor tributaries watersheds of Monroe, Orleans and Niagara Counties. Highest flows in the state are recorded in this area, relieving both watersheds of a long held place on the drought map. Northeast flows hold the below normal to much below normal pattern through the Black River and St. Lawrence River watersheds. Lake Champlain watershed is running mostly normal with one station recording below normal. The central basin starts out with two stations of the Upper Hudson rated below normal, Mohawk River watershed is a mix of below normal to above normal flows, Lower Hudson runs mostly normal through to Long Island, with flows recorded normal to above normal. South facing watersheds run largely normal flow volumes, five stations record below normal through the Allegheny, Chemung, Susquehanna, Delaware and Ramapo watersheds. Finger Lakes region in the interior is trending below normal.

Drought Map
7-day average streamflows from the USGS monitoring network in NYS
Niagara River - Lake Erie has one small area rated below normal, the third of Chautauqua County parallel to the Lake Erie shoreline is the last part of west state hanging on the drought map Sunday. Oswegatchie River channel through St Lawrence County is no longer rated with moderate hydrologic drought, heading back to below normal status overnight to match adjacent Black and St Lawrence River watersheds. Upper Hudson River watershed remains below normal at southwest Essex, central Hamilton and central Warren Counties.

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

Seventy-two streamflow gauges record flooding in the USA Sunday, down from seventy-five Saturday. WT tracks the nation's most common natural disaster dynamics through the states of New York, Ohio, Georgia and Louisiana. As of this report, twenty-two sites record flooding on the network: eight in Georgia, fourteen in Louisiana.

Georgia: Gulf of Mexico basin's Ochlockonee River flooding expanded overnight, now recorded a foot over the channel at GA188 near Coolidge. Ochlockonee River is still flooding downstream near Concord, FL. Withlachoochee River flooding continues at Skipper Bridge Rd near Bemiss and at US84 near Quitman. In the Atlantic basin, Satilla River is back to flooding at GA158 near Waycross, Alabaha River is flooding at GA203 near Blackshear and Little Satilla River runs over minor flood stage near Offerman. Savannah River is still more than a foot out of the channel near Cylo. See black tags indicating flow volume and gauge height, blue tags for 99th percentile flows updated daily here.

Louisiana continues flooding at fourteen sites monitored by the USGS Sunday, the same stations reported flooding yesterday. Region 1 Bayou Bodcau continues a slow decline, three and a half feet above the basin near Shreveport. In Region 2, Little River flooding continues. South into watershed Region 4, Sabine River flooding continues at three monitored sites, one near Burkeville, Bon Wier and Ruliff stations. Calcasieu River carries on flowing out of the channel near Glenmora, trending steady in moderate flood stage near Oberlin and increasing in flow volume near Kinder. Tributary Ouiska Chitto continues to flood near Oberlin. Watershed Region 5 is flooding along LA-190, Bayou Nezpique flooding near Basile and Bayou des Cannes is still flooding further east on LA-190 near Eunice. Mermentau River continues to overflow the channel at Mermentau. In Region 7, Pearl River runs over near Bogulusa, also flooding downstream at the Town of Pearl River. See black tags indicating 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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