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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)

THP Number

County

Location

CalWater Watershed ID

1-14-011

Del Norte  T19N, R01E, Sec. 32, 33; T18N, R01E, Sec. 4, 5; HB&M   Upper Bear Creek (1101.000003)

THP Number

County

Location

CalWater Watershed ID

4-13-026 

El Dorado  T12N, R13E, Sec. 7, 18; MDBL&M  Upper Pilot Creek (1109.300201) 
 4-13-028 El Dorado  T10N, R13E, Sec. 34; MD BL&M  Middle Butte (6532.230302); Van Horn Creek (6532.230402) 
 4-13-027  El Dorado T12N, R14E, Sec. 8-12, 16, 22-24, 26; T12N, R15E, Sec. 7; MDBL&M  Maud Lake (5514.340101): Tells Creek (5514.340301); Union Valley Reservoir (5514.340302) 
4-13-029  El Dorado  T13N, R10E, Sec. 25, 36; MDBL&M  Canyon Creek (1109.200005); Missouri Canyon (5514.410200) 
 4-14-004 El Dorado  T12N, R11E, Sec. 7; MDBL&M  Traverse Creek (5514.320302) 

THP Number

County

Location

CalWater Watershed ID

1-13-102

Lake T19N, R11W, Sec. 12-15, 23, 24; T19N, R10W, Sec. 18; MDBL&M

Salmon Creek (1111.630502); Squaw Valley Creek (1111.630502)

THP Number

County

Location

CalWater Watershed ID

 1-14-002  Humboldt T09N, R01E, Sec. 8, 17, 20; HB&M  McDonald Creek (1108.100001); Pitcher Creek (1108.100001) 
1-14-001  Humboldt  T07N, R02E, Sec. 25, 36; T07N, R03E, Sec. 31, 32; T06N, R02E, Sec. 1; T06N, R03E, Sec. 5, 6; HB&M  Long Prairie Creek (1109.200002); Canyon Creek (1109.200005) 
 1-14-013 Humboldt  T09N, R01E, Sec. 28, 32, 33; HB&M  Pitcher Creek (1108.100001) 
 1-13-130 Humboldt  T02S, R01E, Sec. 16, 17, 19-21; HB&M  Rattlesnake Creek (1112.300401) 
1-14-006 Humboldt  T01N, R01E, Sec. 27, 33, 34; T01S, R01E, Sec. 3, 4; HB&M   Jordan Creek (1111.120202)
 1-14-014 Humboldt  T07N, R03E, Sec. 16, 17, 21, 22, 28; HB&M  Toss-Up Creek (1107.200302) 
 1-14-022 Humboldt  T07N, R02E, Sec. 33, 34; HB&M  Denman Creek (1109.200001) 
 1-14-019  Humboldt T09N, R01E, Sec. 22, 23, 25, 27, 28, 36;  T09N, R02E, Sec. 31; HB&M Pitcher Creek (1108.100001); Bridge Creek (1107.100101) 
 1-14-026 Humboldt  T12N, R02E, Sec. 16, 17, 20, 21; HB&M   Ah Pah Creek (1105.110702)

THP Number

County

Location

CalWater Watershed ID

1-13-118  Mendocino  T23N, R17W, Sec. 3; MDBL&M  Mill Creek (1111.320401); Lower Hollow Tree Creek (1111.320302) 

1-13-102 

Mendocino  T19N, R11W, Sec. 12-15, 23, 24; T19N, R10W, Sec. 18; MDBL&M  Salmon Creek (1111.630503); Squaw Valley Creek (1111.630502) 

1-13-133 

Mendocino  T23N, R17W, Sec. 16, 17, 20, 21; MDBL&M   Lower Hollow Tree Creek (1111.320302)

1-13-132

 Mendocino T13N, R16W, Sec. 10-15, 23; MDBL&M  Lower Alder Creek (1113.630001) 
 1-14-003 Mendocino  T18N, R15W, Sec. 25, 36; MDBL&M  Upper North Fork Big River (1113.300305); James Creek (1113.300301) 

1-13-109

Mendocino  T19N, R16W, Sec. 33, 34; T18N, R16W, Sec. 3, 4; MDBL&M   Little North Fork Noyo River (1113.200201); Lake Cleone (1113.200508)
 1-13-135 Mendocino  T23N, R17W, Sec. 9, 10, 15, 16; MDBL&M  Lower Hollow Tree Creek (1111.320302) 
 1-14-008 Mendocino  T19N, R15W, Sec. 6; T19N, R16W, Sec. 1; MDBL&M  Upper Middle Fork Ten Mile River (1113.130204) 
1-14-004  Mendocino   T22N, R17W, Sec. 8, 9, 16, 17, 21; MDBL&M  Middle Hollow Tree Creek (1111.320301); Upper Hollow Tree Creek (1111.320303)
 1-14-007 Mendocino   T15N, R17W, Sec. 14; MDBL&M  Mouth of Navarro River (1113.500707)
1-14-012   Mendocino T19N, R14W, Sec. 29-31; T19N, R15W, Sec. 25, 36; MDBL&M  Redwood Creek (1113.200101) 
 1-14-003 Mendocino  T21N, R17W, Sec. 29, 32; T20N, R17W, Sec. 5, 8; MDBL&M   Wages Creek (1113.120202); Chadbourne Gulch (1113.130602); Kibesillah Creek (1113.130601)
 1-14-004 Mendocino   T15N, R16W, Sec. 29, 32; MDBL&M  Lower Greenwood Creek (1113.610001)
 1-14-025  Mendocino T21N, R17W, Sec. 20, 29; MDBL&M  Wages Creek (1113.120202) 

THP Number

County

Location

CalWater Watershed ID

 2-13-097  Nevada T16N, R10E, Sec. 1, 9, 10, 15, 16, 20, 21; MD B&M  Buckeye Ridge (5516.340304); Upper Steephollow Creek (5516.340202); Burlington Ridge (5517.200104) 
2-14-006  Nevada T16N, R09E, Sec. 24; MD B&M   Buckeye Ridge (5516.340304); Missouri Canyon (5516.340301)

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)

THP Number

County

Location

CalWater Watershed ID

 1-13-107  Santa Cruz T10S, R01E, Sec. 24; T10S, R02E, Sec. 19; MDBL&M  Boulder Creek (3304.120203) 
1-14-009  Santa Cruz  T10S, R01W, Sec. 2, 3; MDBL&M  West Branch Soquel (3304.130105) 
 1-13-082  Santa Cruz T09S, R03W, Sec. 10, 15; MDBL&M   Boulder Creek (3304.120203)

THP Number

County

Location

CalWater Watershed ID

2-13-103  Shasta  T38N, R03W, Sec. 5-7; T39N, R03W, Sec. 32; T38N, R04W, Sec. 12; MDB&M Lower Soda Creek (5525.210202); Middle Soda Creek (5525.210201) 
 2-14-003 Shasta  T37N, R03E, Sec. 5, 8; T38N, R02E, Sec. 13; T38N, R03E, Sec. 8, 17-20, 28, 29, 32-34; MDBL&M   Clayton Creek (5526.310101); Clark Creek (5526.310103); Dry Creek (5526.430400)
 2-13-024 Shasta  T38N, R02E, Sec. 14, 20, 23, 26-30, 35; MD B&M  Clark Creek (5526.310103); Rock Creek (5526.310203) 

THP Number

County

Location

CalWater Watershed ID

 2-13-063 Siskiyou  T39N, R02W, Sec. 25, 35, 36; MD BL&M  Angel Creek (5505.240702) 

THP Number

County

Location

CalWater Watershed ID

 2-11-030 Tehama  T28N, R06E, Sec. 2, 11-14, 24; T29N, R06E, Sec. 18, 19, 27, 35; MDBL&M  Stump Ranch (5518.440102); Willow Creek (5518.440303); Louse Creek (5518.440301); Johnson Creek (5518.440302) 

THP Number

County

Location

CalWater Watershed ID

 2-14-009 Trinity   T32N, R08W, Sec. 3, 10; MD BL&M Little Grass Valley Creek (1106.310501) 

THP Number

County

Location

CalWater Watershed ID

2-13-001

Yuba T17N, R07E, Sec. 2, 3; T18N, R07E, Sec. 28 Colgate Powerhouse (5517.140002); Dobbins Creek (5517.140001); New Bullards Bar Reservoir (5517.140004)

 

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.