Ashville, Alabama, in the northern part of St. Clair County was the county seat from 1821 to 1907. A constitutional amendment in 1907 established Pell City as the second county seat, and for many years St. Clair County was the only county in the country with two full-service county seats. Both county seats remain operational to this day although Pell City has far surpassed Ashville in growth in large part due to I-20 and Logan Martin Lake. The construction of Logan Martin Dam in 1964 created the lake and a large recreational area, which brought new businesses, temporary summer residents and tourists, and hundreds of new permanent residents building new homes along the new lake.