most notably the legendary Buenaventura. The Buenaventura was also thought to be a navigable waterway to the Pacific Ocean possibly providing an alternative to packing loads of furs back to St. Louis. The previous spring, Smith had searched for rivers flowing to the Pacific west and northwest of the Great Salt Lake. Although he pushed into eastern Nevada, he failed to find the Humboldt River, the probable source of the legend of the Buenaventura. Having determined the Buenaventura must lie further south, Smith made plans for an exploratory expedition deep into the Mexican territory of Alta California.