During 1987, 34 Native American and 7 Euramerican archaeological sites were identified along North Fork and main stem Cache Creek in Lake County approximately five miles northeast of Clear Lake. Five of the 34 Native American sites had historic materials. The study area encompasses some 3500 acres of public lands wilderness under joint Federal and State management. As part of long-term cultural resource management, a data base was established through intense examination and recordation of each site plus surface collection of specific cultural materials such as diagnostic projectile points, tools, beads and ornaments, and obsidian specimens for hydration analysis and sourcing. Preliminary results suggest four periods of use: 1) the Middle Archaic Period, 5000 to 3000 B.P.; Phase 1 of the Emergent Period, A.D. 900 to 1500; 3) Phase 2 of the Emergent Period, A.D. 1500 to 1800; and 4) the Historic Period, from A.D. 1800.