Journal Thursday, September 17, 2026
Mid September: Truckee at Reno at 119% of typical
A daily record of the Truckee basin for Thursday, September 17, 2026. Same honesty rules as Today's Pulse. Forecasts stay labeled.
It's mid September, when the Truckee is usually in its summer low, and the Truckee at Reno is in line with typical for this date, at 119% of the historical median. That river water is what treatment plants draw for Reno and Sparks taps, and what still has to reach Pyramid Lake at the end of the system. How much is in the river today is the live supply those plants and the terminus are sharing.
The Sierra snowpack is only a trace (up to 0.3 in of water in the snow).
Tahoe sits at 6,227.09 ft, 2.01 ft under the legal ceiling, 4.09 ft above its 6,223 ft natural rim, high enough to spill into the Truckee. Pyramid Lake's USGS surface reading is 3,802.04 ft, the terminus.
The four upstream reservoirs hold 64% of listed capacity, Stampede carrying most of that volume.
NWS River Forecast Center outlook, not the USGS gauge: the Truckee at Reno is expected to stay near 367 cfs through Monday, September 21 at 5:00 AM PDT. Source: https://water.noaa.gov/gauges/TRRN2.
Beach postings are a separate clock from the river. Tahoe has a recreational HAB advisory on California's map: Caution at Lake Tahoe Community College (Trout Creek), Caution at Site 13 (Tahoe Keys Lagoons), and Caution at Star Harbor (Lake Tahoe). That posting is a beach warning for swimming and pets, not municipal tap water.
Reno weather: 62°F, 0 mph wind, with air quality rated Unhealthy for Sensitive Groups: members of sensitive groups may experience health effects; the general public is less likely to be affected. Air in the Truckee Meadows sits on its own weather.
U.S. Drought Monitor: worst of Reno, Tahoe, and Pyramid Lake is D1 Moderate Drought. Reno D1 Moderate Drought; Lake Tahoe D1 Moderate Drought; Pyramid Lake D1 Moderate Drought. That map updates weekly. A late August Drought.gov California-Nevada update noted that evaporative demand can stay high even when water-year precipitation is near normal.
No active NWS warnings or advisories for this basin. That is a reading, not a missing feed.
The ground keeps its own count. The USGS catalog recorded 3 earthquakes in the region over the last 24 hours.
Active NIFC perimeters in this basin: Floriston (613.287 acres).
None of those lake and river numbers is a tap-quality reading. Reno and Sparks drinking water is treated river water. TMWA's published annual mix is 85–95% surface water and about 15% groundwater from 82 wells. Chalk Bluff is the main plant, 90 MGD. This site has no live tap-quality feed. Groundwater is a Story chapter here, not a live well feed. TMWA's mix includes about 15% from 82 wells, mainly summer peaks and backup.
On Story: Larger Sierra fires send ash and sediment into reservoirs. No agency publishes a public total for water used on Caldor or other regional fires.
On Story, Independence Lake: The upper 28 ft is owned and operated by TMWA as Reno–Sparks’s drinking-water drought reserve.