Lone Tree Mineral Spring
Lone Tree Mineral Spring emerges at 73°F essentially at roadside in San Joaquin County, just 1.2 feet from pavement near Tracy. This mild thermal feature represents a subtle geothermal anomaly in the rolling grassland foothill landscape, rising only 10 degrees above ambient air temperature (63°F).
Lone Tree Mineral Spring is positioned directly along the road in the Oak Ranges foothills at 868 feet elevation. The spring emerges from sandy soil in a landscape of native oak savannas and grasslands typical of the inner Coast Ranges. Water pools briefly near the road before flowing into natural drainage in an easily accessible setting.
The spring is immediately accessible from the road near Tracy. No facilities exist at the location. The mild water temperature (73°F) offers minimal recreational soaking value. This site is primarily of geothermal interest as a mapped thermal feature rather than a destination spring. Visit anytime; the valley's hot, dry summers and mild winters pose no extreme access barriers."
Lone Tree Mineral Spring marks a small thermal anomaly in the San Joaquin Valley's eastern margins. The modest 10-degree elevation above ambient temperature suggests either mixing with cooler groundwater or residence time in shallow aquifers insufficient for major heating. This region sits above basement rocks associated with the Sierra Nevada batholith.
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