Water Temperature Data for Porkchop Geyser, Yellowstone National Park
This pool is located at the southwest end of Norris’ Back Basin.
It erupted as a geyser until 1989 when it erupted forcefully, hurling rock from its vent to form a 5-m-wide pool. The water is neutral-to-alkaline and rich in Cl. The temperature is measured ~20 cm beneath the pool surface, close to the pool’s edge.
![Porkchop Geyser, Norris Geyser Basin, Yellowstone National Park....](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/full_width/public/vhp_img34.jpg?itok=CFhMabOO)
Water temperature is measured beneath the pool surface. Temperature increases may reflect increased inflow of thermal water. Sudden decreases in temperature could be a result of a drop in water level beneath that of the temperature probe. This will usually result in large diurnal (24-hour) variations as the probe measures air temperature instead of water temperatures. Smaller diurnal variations are normal in pools.
Daily Temperature Graph
![](https://volcanoes.usgs.gov/vsc/captures/yellowstone/porkchop-24h.png)
Weekly Temperature Graph
![](https://volcanoes.usgs.gov/vsc/captures/yellowstone/porkchop-7d.png)
Monthly Temperature Graph
![](https://volcanoes.usgs.gov/vsc/captures/yellowstone/porkchop-1m.png)
Additional Information
This pool is located at the southwest end of Norris’ Back Basin.
It erupted as a geyser until 1989 when it erupted forcefully, hurling rock from its vent to form a 5-m-wide pool. The water is neutral-to-alkaline and rich in Cl. The temperature is measured ~20 cm beneath the pool surface, close to the pool’s edge.
![Porkchop Geyser, Norris Geyser Basin, Yellowstone National Park....](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/full_width/public/vhp_img34.jpg?itok=CFhMabOO)
Water temperature is measured beneath the pool surface. Temperature increases may reflect increased inflow of thermal water. Sudden decreases in temperature could be a result of a drop in water level beneath that of the temperature probe. This will usually result in large diurnal (24-hour) variations as the probe measures air temperature instead of water temperatures. Smaller diurnal variations are normal in pools.
Daily Temperature Graph
![](https://volcanoes.usgs.gov/vsc/captures/yellowstone/porkchop-24h.png)
Weekly Temperature Graph
![](https://volcanoes.usgs.gov/vsc/captures/yellowstone/porkchop-7d.png)
Monthly Temperature Graph
![](https://volcanoes.usgs.gov/vsc/captures/yellowstone/porkchop-1m.png)