Trinity Transit provides services between the communities of Douglas City, Hayfork, Junction City, Lewiston, Redding, Weaverville, and Willow Creek.
Trinity Transit was originally operated by the Human Response Network (HRN), which began service in 1988.
In March 2008, service was reinstated to Lewiston as a pilot program, along with two new routes to Trinity Center and Willow Creek.
The route to Trinity Center was discontinued after Labor Day in 2009 due to poor ridership.
After procuring buses through the American Recovery and Reinvestment Act of 2009, intercity service between Weaverville and Willow Creek was increased to three days per week initially and a route between Weaverville and Redding began.