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WT Staff

Much below normal streamflows in Mohawk River watershed
Mohawk River watershed on the drought map

Water news for Monday, April 29, 2024 1004 am EDT

Flows and Flood Tracker provisional data from the network of USGS streamflow monitors
Ninety-three streamflow gauges record flooding in the USA Monday, up from thirty-five on Sunday. WT tracks the nation's most common natural disaster dynamics through the states of New York, Ohio, Georgia and Louisiana. As of this report we are tracking 4 active floods monitored in the USGS network, all four in Louisiana.

The current streamflow map for NYS Monday has much below normal flows recorded in the west Catskills' tributaries of the Mohawk River. The below normal and much below normal streamflows through the northern counties continues, the drought map area taking on more territory across the north with the Black River watershed escalated to moderate drought over the weekend. Mohawk River channel counties are rated below normal Monday, joining the Upper Hudson watershed, still rated below normal since Saturday. A portion of the Susquehanna River watershed in the south interior has been marked up on the drought map, a below normal rating for Tioga County. NYS records no active flooding as of this report, the same station runs 99th percentile on Long Island, Swan River is high flow at East Patchogue.

Louisiana appeared to be heading out of the active flooding business, however the drying out trend has reversed over the weekend in the west. Two new floodings started up over the last day and a half. On Saturday night, Calcasieu River breached flood stage near Glenmora, presently running six inches over and rising. This morning around 630 am, Bayou Anococo got out of the channel near Rosepine, quickly gaining more than two feet over minor flood stage and climbing steeply as of this report. In Region 1 Bayou Bodcau is still on a gradual declining flow trend near Shreveport, currently eight feet ten inches above the basin there. Down in the southwest, Sabine River continues to flow more than a foot over the channel near Ruliff, TX.

Georgia has managed to keep all its waterways in line over the weekend, all river flooding wrapped up last week, we are now watching the drought map grabbing up territory on both sides of the drainage divide. The advancement of the drought map into the Upper Savanaah River watershed Monday has claimed Rabun, east Stephens and northeast Hart Counties at the below normal rating. Further down the Savannah River drainage area, the below normal rating has shifted to take McDuffie, north Jefferson and central Burke Counties into below normal rating. No flooding is reported in the Georgia network Monday, nor extremes of high or low flow.

Not to be outdone, Ohio is also posting moderate drought-rated area Monday. Ashtabula-Chagrin Rivers watershed in the northeast Lake Erie drainage basin escalated into moderate drought overnight with adjacent Grand River watershed this morning showing up below normal. Blanchard River, Huron-Vermilion, Black-Rocky Rivers watersheds remain at below normal rating for the Lake Erie drainage basin, as reported over the weekend. Little Muskingum River watershed hangs in at the below normal rating on the Ohio-Mississippi basin side of the divide. Another Ohio River minor tributary watershed has jumped into the below normal bucket Monday, the Shade River watershed's seven day average streamflow has officially fallen below the seasonal normal, earning Meigs County a spot on the drought map. Brush-Whiteoak and Little Miami River watersheds remain below normal as reported here yesterday. As of this report, there are no floodings, extreme high or low flows to report in the Ohio network.

See black tags on the map for active flood, blue for high flow, 99th percentile or more.

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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