Water Resources of the United States

PROJECT ALERT NOTICE (CA) high flow measurements after a strong tropical storm

Date: Mon, 02 Jan 2023 19:09:01 EST

Summary: More high-flow measurements after strong tropical storm on New Year's Eve

For the third day, USGS crews are measuring high flow at USGS streamgages in the San Francisco and Santa Cruz areas. Although the rainfall moved south on Saturday night, high flows are still occurring in the area. The storm left 2 people dead, and power outages are in the process of being repaired. Roadways have been opening up.

On Saturday and Sunday, 50 total direct discharge measurements were made at 41 sites. Many measurements were the highest made in 25 years, and a couple were the second highest made. A few sites with short periods of record had the highest measurements made. The Cosumnes River at Michigan Bar, with over 100 years of record, had the highest direct measurement ever made at the site.

Today, 5 CA WSC crews of 11 people have been measuring at streamgages not measured on Saturday or Sunday. The 1 streamgage damaged by the storm was slated for repair.

This afternoon, a new albeit weaker system has brought rain to northern California. Later this week, a strong system is predicted for California, raising concerns about more flooding.

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