Lake Conroe is a 21,000-acre (85 km2) lake in Montgomery County, Texas, United States. Even though it is named Lake Conroe, only the southern third of the lake is in Conroe, Texas. Most of the lake is in unincorporated Montgomery County, while a small northern sliver juts into neighboring Walker County where the Baker Bridge is located. The lake lies on the West Fork of the San Jacinto River, just west of Interstate 45 off State Highway 105 in Montgomery and Walker counties. Lake Conroe is a popular attraction for boating, jet-skiing, and fishing.