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
2-12-080	Butte	T21N, R07E, Sec. 13, 24, 25, 36; T21N, R08E, Sec. 3-5, 7-9, 17-19; T22N, R08E, Sec. 26, 33; MDBL&M	Upper Fall River (5518.320602)
2-13-002	Butte	T21N, R04E, Sec. 24; T21N, R05E, Sec. 19, 21; MDBL&M	Wild Yankee Creek (5518.110301); Bloomer Ravine (5518.110303); East Fork Canyon Creek (5518.110302)
THP Number	County	Location	CalWater Watershed ID
4-13-001	El Dorado	T12N, R11E, Sec. 18; MDBL&M	Bear Creek (1105.110701)
THP Number	County	Location	CalWater Watershed ID
1-12-103	Humboldt	T01N, R05E, Sec. 4, 9; HB&M	Sulphur Creek (1111.220301)
1-12-126	Humboldt	T01N, R02E, Sec. 5, 7, 8, 17, 18; HB&M	Hely Creel (1111.210003); Root Creek (1111.220604); Bear Creek (1111.120101)
1-13-005	Humboldt	T04N, R01E, Sec. 21, 22, 27, 28, 33; HB&M	Lower North Fork Elk River (1110.000201)
1-12-127	Humboldt	T01S, R01E, Sec. 9, 10, 15-17; HB&M	Jordan Creek (1111.120202); Dean Creek (1111.110103)
1-13-008	Humboldt	T02N, R02W, Sec. 18; HB&M	Guthrie Creek (1112.100002)
1-13-010	Humboldt	T09N, R01E, Sec. 25, 26, 35; HB&M	Grizzly Creek (1111.220602)
1-13-011	Humboldt	T08N, R02E, Sec. 23-26; HB&M	Panther Creek (1107.200403)
1-13-012	Humboldt	T08N, R01E, Sec. 16, 24, 25; T08N, R02E, Sec. 19, 30; HB&M	Maple Creek (1108.100003)
1-13-024	Humboldt	T09N, R01E, Sec. 32; T08N, R01E, Sec. 3-5; HB&M	Maple Creek (1108.100003)
1-13-013	Humboldt	T01N, R02E, Sec. 23, 24; HB&M	West Side Creek (1112.200205)
1-13-030	Humboldt	T07N, R03E, Sec. 28, 29, 32, 33; T06N, R03E, Sec. 5; HB&M	Toss-up Creek (1107.200302); Minor Creek (1107.200101); Lupton Creek (1107.200102)
1-13-026	Humboldt	T08N, R03E, Sec. 20; HB&M	Lower Lacks Creek (1107.200201)
1-13-029	Humboldt	T04S, R03E, Sec. 17, 20, 21; HBL&M	Garberville (1111.320806); Lower Sprout Creek (1111.320701); Miller Creek (1111.320801); Seely Creek (1111.320802)
THP Number	County	Location	CalWater Watershed ID
1-12-119	Mendocino	T12N, R16W, Sec. 26, 27, 34; MDBL&M	Point Arena Creek (1113.700302)
1-12-115	Mendocino	T12N, R16W, Sec. 26, 27, 34; MDBL&M	North Fork Alder Creek (1113.630003)
1-13-014	Mendocino	T20N, R16W, Sec. 9, 15, 16; MDBL&M	Bald Hill Creek (1113.130402)
1-13-009	Mendocino	T18N, R16W, Sec. 1; T19N, R15W, Sec. 18, 19, 30, 31; T19N, R16W, Sec. 25, 35, 36; MDBL&M	Upper South Fork Ten Mile River (1113.130304); Duffy Gulch (1113.200202)
THP Number	County	Location	CalWater Watershed ID
2-13-009	Placer	T13N, R12E, Sec. 3, 4, 6, 8, 10; MDBL&M	Brushy Canyon (5514.420301); Long Canyon (5514.430102)
THP Number	County	Location	CalWater Watershed ID
1-12-003	San Mateo	T08S, R04W, Sec. 24; T09S, R02W, Sec. 20, 29; MD BL&M	Butano Creek (2202.400302); Gazos Creek (3304.200004); Love Creek (3304.120201); Bear Creek (3304.120300)
1-13-017	San Mateo	T08S, R04W, Sec. 26, 34-36; MDBL&M	Gazos Creek (3304.200004)
THP Number	County	Location	CalWater Watershed ID
1-12-099	Santa Cruz	T09S, R04W, Sec. 26, 35; MDBL&M	Waddell Creek (3304.110101)
1-13-004	Santa Cruz	T10S, R01E, Sec. 36; MDBL&M	Corralitos Creek (3305.100102)
1-12-071	Santa Cruz	T10S, R03W, Sec. 26; MDBL&M	San Vicente Creek (3304.110203); Laguna Creek (3304.110302)
1-13-016	Santa Cruz	T10S, R01E, Sec. 24, 25; MDBL&M	Corralitos Creek (3305.100102)
THP Number	County	Location	CalWater Watershed ID
1-12-040	Sonoma	T07N, R11W, Sec. 7, 8, 17; MDBL&M	Willow Creek (1114.110401)
1-13-023	Sonoma	T11N, R14W, Sec. 29, 32-34; MDBL&M	Little Creek (1113.830004); Lower Rockpile Creek (1113.820003)
1-13-020	Sonoma	T10N, R13W, Sec. 35; MDBL&M	Tobacco Creek (1113.840304)
THP Number	County	Location	CalWater Watershed ID
2-12-075	Tehama	T24N, R09W, Sec. 4, 5, 7-10, 15-17; MD BL&M	Lower Fish Creek (5523.100202); McClure Creek (5523.100102); Auger Creek (5523.100203)
THP Number	County	Location	CalWater Watershed ID
4-12-031	Tuolumne	T05N, R16E, Sec. 1-3, 9-12, 15, 16; T05N, R17E, Sec. 5, 6; T06N, R16E, Sec. 36, T06N, R17E, Sec. 31, 32; MDB&M	Middle Beaver Creek (6534.500402)
THP Number	County	Location	CalWater Watershed ID
1-12-076	Trinity	T02S, R06E, Sec. 31; T03S, R05E, Sec. 1, 2, 12; T03S, R06E, Sec. 6, 7; HB&M	Hoover Creek (1111.410203)
2-12-069	Trinity	T31N, R09W, Sec. 31-33, 35; T30N, R09W, Sec. 2-4, 9; MD BL&M	East Fork Browns Creek (1106.320002); Upper Duncan Creek (5524.360502); Johnson Creek (1106.310103)

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

Other Documents Prepared by CGS/FWGP

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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