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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)

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

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)

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

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.