Forest and Watershed Geology Program

Forest and Watershed Geology Program - Documents

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THP Engineering Geologic Reviews

CGS staff conduct engineering geologic field reviews of select Timber Harvesting Plans (THP) as part of a multi-agency review team lead by the California Department of Forestry and Fire Protection (CDF). Upon completion of the field reviews, CGS staff prepare memoranda that summarize pertinent observations and recommendations made during the field review. These memoranda are submitted to CDF, the lead agency for timber harvest plan approval, for consideration as part of the THP review process.

Recently submitted THP engineering geologic review memoranda prepared by CGS staff are presented below. These memoranda are available for viewing on this web site for approximately 90 days after posting. If you are interested in one of the CGS memoranda that is more than 90 days old, please send an email with the THP number to: fwgp@consrv.ca.gov and we will email a PDF if available (THPs beginning in 2002) or direct you to CDF for a hard copy. For more information on the THP review process, go to CDF's web page.

THP Number	County	Location	CalWater Watershed ID
4-12-003	Calaveras	T06N, R13E, Sec. 1; MDB&M	Bear Creek (1105.110701)
THP Number	County	Location	CalWater Watershed ID
4-12-001	El Dorado	T10N, R12E, Sec. 12; T10N, R13E, Sec. 7; MDB&M	Clear Creek (2202.300004); South Fork Weber Creek (5514.310101)
4-12-002	El Dorado	T12N, R11E, Sec. 17, 19, 20; MDB&M	Bear Creek (1105.110701)
THP Number	County	Location	CalWater Watershed ID
1-11-125	Humboldt	T01S, R02E, Sec. 11, 12; HB&M	Chadd Creek (1111.120102)
1-11-132	Humboldt	T01N, R02E, Sec. 10, 11, 13-15, 23, 24; HB&M	Root Creek (1111.220604)
1-10-121	Humboldt	T09N, R01E, Sec. 25, 26, 35; HB&M	Beer Bottle Creek (1112.200001); Peaked Creek (1112.200102)
1-11-137	Humboldt	T04N, R03E, Sec. 9, 10, 15, 16; HB&M	Boulder Creek (1109.300503); Barry Ridge (1109.300405)
1-11-139	Humboldt	T03N, R01E, Sec. 9, 10, 15; HB&M	Upper So. Fork Elk River (1110.000301)
1-12-004	Humboldt	T07N, R01E, Sec. 3, 4, 9; T08N, R01E, Sec. 26, 27, 33, 34; HB&M	Lower South Fork (1108.200001); Bullwinkle Creek (8109.200002)
1-11-140	Humboldt	T09N, R01E, Sec. 25, 26, 35; HB&M	Burr Creek (1111.130201)
1-12-007	Humboldt	T04N, R03E, Sec. 23, 25-27, 34-36; HB&M	Wilson Creek (1109.300402); Graham Creek (1109.300403); Goodman Prairie Creek (1109.300404)
1-12-015	Humboldt	T09N, R01E, Sec. 4; T10N, R01E, Sec. 28, 32, 33; HB&M	McDonald Creek (1108.100002)
1-12-008	Humboldt	T03S, R04E, Sec. 2, 10-14; T03S, R04E, Sec. 7, 18; HB&M	Soda Creek (1111.410302); Basin Creek (1111.410401); Willow Draw (1111.410402)
1-12-011	Humboldt	T02N, R02E, Sec. 25, 26; HB&M	Stevens Creek (1111.220603)
1-12-003	Humboldt	T04S, R02E, Sec. 23, 25, 26, 35; HB&M	Miller Creek (1111.320801)
1-12-017	Humboldt	T03N, R01E, Sec. 2, 3, 11; HB&M	Lower North Fork Elk River (1110.000201)
1-11-014	Humboldt	T09N, R01E, Sec. 25, 26, 35; HB&M	Howe Creek (1111.110101); Price Creek (1111.110102)
1-12-020	Humboldt	T02S, R03E, Sec. 4, 5, 8-10, 16; HB&M	Thompson Creek (1111.410602); Canoe Creek (1111.310102); Elk Creek (1111.310101)
1-12-001	Humboldt	T02N, R04E, Sec. 12-14; T02N, R05E, Sec. 7, 8, 17-20; HB&M	Bear Creek (1109.300101); Olmstead Creek (1109.300301; Holm Creek (1109.300304)
THP Number	County	Location	CalWater Watershed ID
1-10-106	Mendocino	T18N, R14W, Sec. 6, 7; T18N, R15W, Sec. 1, 11, 12; MDBL&M	Olds Creek (1113.200102); McMullen Creek (1113.200106)
1-11-111	Mendocino	T18N, R17W, Sec. 11; MDBL&M	Little North Fork Noyo River (1113.200201)
1-11-109	Mendocino	T12N, R15W, Sec. 4-6, 8, 9; T12N, R15W, Sec. 31, 32: MD BL&M	North Fork Garcia (1113.700205); Upper Brush Creek (1113.640002); Victoria Creek (1113.700103)
1-11-138	Mendocino	T14N, R15W, Sec. 4, 5, 8; MD BL&M	Upper Navarro River (1113.500701)
1-11-012	Mendocino	T14N, R13W, Sec. 32-35; T13N, R13W, Sec. 2-5, 10; MDBL&M	Middle Fork Feliz Creek (1114.310603); Soda Creek (1113.500301)
1-12-009	Mendocino	T16N, R16W, Sec. 3, 10, 11, 14; MDBL&M	Middle Albion River (1111.400001)
1-12-005	Mendocino	T24N, R13W, Sec. 20, 22, 23, 26, 27; MDBL&M	Lower Hulls Creek (1111.500103); Hulls Valley (1111.500102)
1-12-012	Mendocino	T19N, R16W, Sec. 3-6: MDBL&M	Bear Haven Creek (1113.130203); Lower Middle Fork Ten Mile River (1113.130202)
1-12-019	Mendocino	T14N, R16W, Sec. 2-4, 10, 11, 14, 15; T15N, R16W, Sec. 33; MDBL&M	Lower Greenwood Creek (1113.610001)
1-09-188	Mendocino	T16N, R15W, Sec. 22; MDBL&M	John Smith Creek (1113.500601)
1-12-023	Mendocino	T17N, R15W, Sec. 22, 23, 26, 27; MDBL&M	Russell Brook (1113.300202)
1-12-024	Mendocino	T14N, R15W, Sec. 31-33; MD BL&M	Upper Elk Creek (1113.620002)
1-12-033	Mendocino	T16N, R16W, Sec. 9, 10, 15, 16; MDBL&M	South Fork Albion River (1113.400002)
1-12-029	Mendocino	T11N, R15W, Sec. 11-14; MDBL&M	Robinson Creek (1113.810002); Doty Creek (1113.810003)
THP Number	County	Location	CalWater Watershed ID
1-11-136	San Mateo	T08S, R03W, Sec. 9-11, 15, 16, 21, 22; MD BL&M	Slate Creek (2202.400101); Waterman Creek (2202.400106)
THP Number	County	Location	CalWater Watershed ID
1-11-115	Santa Cruz	T08S, R03W, Sec. 36; MD BL&M	Castlerock Falls (3304.120120)
1-12-014	Santa Cruz	Un-Apportioned part of the Shoquel Augmentation; MDBL&M	Soquel Creek (3304.130101)
1-09-087	Santa Cruz	T09S, R03W, Sec. 1; MD BL&M	Castle Rock Falls (3304.120102)
1-12-031	Santa Cruz	T10S, R01W; Sec. 23; MD BL&M	Soquel Creek (3304.130101)
THP Number	County	Location	CalWater Watershed ID
2-08-105	Shasta	T37N, R04W, Sec. 6; MD BL&M	Mears Creek (5525.100102)
1-12-033	Shasta	T36N, R05W, Sec. 21; MD BL&M	Lower Slate Creek (5525.100204); Campbell Creek (5525.100206)
THP Number	County	Location	CalWater Watershed ID
2-11-021	Siskyou	T41N, R09W, Sec. 28; MD BL&M	Paynes Lake Creek (1105.420404)
THP Number	County	Location	CalWater Watershed ID
1-12-013	Sonoma	T09N, R13W, Sec. 27, 34; MD BL&M	Upper South Fork Gualala River (1113.850104)

Post Fire Erosion and Slope Stability

California Geological Survey staff provide advisory services to the Department of Forestry and Fire Protection regarding geologic and slope stability concerns associated with wildfires and vegetation management plans in mountainous areas of California. The results of some of this work are presented below.

Document	Description
Article	California Fires, Floods, and Landslide, 2005
PowerPoint	California Debris Flows & The Effects of Fire, 2005
California Geology Article	Fire and Rain Equal Mudflows, Big Sur 1972
California Geology Article	Hazard Evaluation Following the Tunnel (Oakland Hills) Fire, Oct 19-23, 1991
Burn Site Form	California Geological Survey Burn Site Evaluation Form

Document	Description
SR 217	Special Report 217 Geologic Compilation of Quaternary Surficial Deposits in Southern California. Contains report and a complete GIS digital database for all 16 maps.
Memoranda	Review of July 2002 EPA Analysis Impacts of Timberland Management on Water Quality. Dated November 27, 2002.
Memoranda	Regional Geologic Information and Preliminary Geomorphic Characterization of Bear Creek at Quigley Grove, Humboldt County, California. Dated February 24, 2003.
NRCS Report Appendix 1 Appendix 2	Geologic Consequences of Tree Removal Under the National Resources Conservation Service (NRCS) Sponsored Southern California Tree Mortality Emergency Watershed Protection Program. Dated November 28, 2006. Appendix 1 - Inventory Sheet Appendix 2 - Photos
SP 120 (PDF 635KB) SP 120 Errata (PDF 67 KB)	Special Publication 120 Index to Published Landslide Maps, California Coast Ranges, Monterey County and North for Use in Timber Harvesting Plan Preparation on Non-Federal Land, 1999.
Vegetation Island Review, Oceano Dunes SVRA	Geologic review of shape, size, and geomorphology of 20 vegetation islands in Oceano Dunes SVRA. Describes geologic conditions and sand sample analyses, dune processes, sediment transport, sedimentation and moisture retention, historical changes over more than 60 years, and suggested management practices.
SLOAPCD Phase 2 Study	At the request of California State Parks, CGS prepared this evaluation of the San Luis Obispo County Air Pollution Control District’s “South County Phase 2 Particulate Study” dated February 2010.

California Geological Survey

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