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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

4-14-010

Alpine T10N, R20E, Sec. 21;  MDBL&M Millberry Creek (8632.100604)

THP Number

County

Location

CalWater Watershed ID

2-14-012

Butte T20N, R07E, Sec. 2-4, 9, 10, 15, 16, 21; T21N, R07E, Sec. 9, 10, 13-16, 22-27, 34-36; T21N, R08E, Sec. 18, 19, 30, 31; MDBL&M Middle Fall River (5518.320601); Rock Creek (5518.220101); Upper Sucker Run (5518.220202); Upper Fall River (5518.320603)

THP Number

County

Location

CalWater Watershed ID

 4-14-006 Calaveras  T05N, R14E, Sec. 2, 3, 10, 11, 13-15, 24; MDBL&M  Fine Gold Mine (6532.600805); Upper Jesus Maria Creek (6533.200203) 
 4-13-030 Calaveras  T05N, R13E, Sec. 29, 30; MDBL&M  Middle Jesus Maria Creek (6533.200201) 
4-14-011 Calaveras   T05N, R15E, Sec. 1-3, 9-11, 15-17, 20, 21; T06N, R15E, Sec. 36; T06N, R16E, Sec. 31; MD BL&M  Upper San Antonio Creek (2204.300101)

THP Number

County

Location

CalWater Watershed ID

1-14-046

Del Norte T18N, R01W, Sec. 1-4; T19N, R01W, Sec. 32, 34-36; HB&M South Fork of Winchuck River (1101.000001); Gilbert Creek (1101.000002)
 1-14-065 Del Norte  T14N, R01E, Sec. 23-25; T14N, R02E, Sec. 19, 30; HB&M  Lower West Fork Hunter Creek (1105.110803); Lower Turwar Creek (1105.110801)
 1-14-070 Del Norte  T19N, R04E, Sec. 34; T18N, R04E, Sec. 2-4, 11, 12; HB&M  Elk Creek (1102.200302); West Fork Illinois River (1102.200301) 

THP Number

County

Location

CalWater Watershed ID

 4-14-002  El Dorado T13N, R10E, Sec. 26, 35; MDBL&M  Canyon Creek (1109.200005) 

THP Number

County

Location

CalWater Watershed ID

 1-14--045 Humboldt  T04N, R01W, Sec. 1  Lower Elk River (1110.000402) 
 1-12-004 Humboldt  T02N, R01E, Sec. 23; HB&M  Salt Creek (1111.110303) 
1-14-007 Humboldt  T04N, R02E, Sec. 16, 17; HB&M  Freshwater Creek (1110.000101) 
 1-14-057 Humboldt  T06N, R02E, Sec. 36; T05N, R02E, Sec. 1; T06N, R03E, Sec. 29-31; HB&M  Upper Cannon Creek (1109.300602); Lower Cannon Creek (1109.300603) 
 1-14-062 Humboldt  T06N, R02E, Sec. 5, 6; HB&M   Squaw Creek (1109.100105); Powers Creek (1109.100104)
 1-14-060 Humboldt  T06N, R03E, Sec. 28, 32, 33; HB&M   Upper Canon Creek (1109.300603)
 1-14-066 Humboldt  T04N, R04E, Sec. 14, 15, 21-23; HB&M  Cow Creek (1106.210201); Twin Lakes Creek (1107.300103) 
1-14-059  Humboldt   T09N, R01E, Sec. 5, 8, 17, 18; HB&M Pitcher Creek (1108.100001); McDonald Creek (1108.100002) 
 1-14-055 Humboldt   T02N, R02E, Sec. 5, 6; T03N, R02E, Sec. 29-33; HB&M Corner Creek (1111.230204) 
1-14-008   Humboldt T01S, R03E, Sec. 33, 34;  Thompson Creek (1111.410602) 
1-14-069  Humboldt   T05N, R01E, Sec. 16; HB&M (1110.000503); (1110.000105) 
 1-14-073 Humboldt  T09N, R01E, Sec. 5, 7, 8, 13, 14, 17-19;   Upper Roach Creek (1105.110306); Mid Roach Creek (1105.110301); Upper Tully Creek (1105.110205); Lower Tully Creek (1105.110201) 
 1-13-041 Humboldt  T02N, R02W, Sec. 14; HB&M  Salt River (1111.110303) 
1-14-068 Humboldt  T04N, R04E , Sec. 20-22, 27-29; HB&M Boulder Creek (1107.300503); Twin Lakes Creek (1107.300103) 
 1-14-083 Humboldt  T01N, R03E, Sec. 25, 27, 34-36; HB&M  Chalk Rock (1111.220605); Burr Creek (1111.130201) 
 1-14-084 Humboldt  T01N, R02W, Sec. 2, 4, 5; T02N, R02W, 32, 33; HB&M  Guthrie Creek (1112.100002); Flyblow Gulch (1112.100001); Price Creek (1111.110102) 
 1-14-087 Humboldt   T04N, R04E, Sec. 5, 6, 8, 9;  Bradford Creek (1107.300101); Twin Lakes Creek (1107.300103)

THP Number

County

Location

CalWater Watershed ID

2-14-041

Lassen T31N, R10E, Sec. 5-8, 18; T32N, R10E, Sec. 32; MD B&M Fox Mtn. (8637.310601); Martin Creek (8637.310301); Wildcat Point (8637.310604)

THP Number

County

Location

CalWater Watershed ID

1-14-036  Mendocino  T12N, R16W, Sec. 2, 3, 11; T13N, R16W, Sec. 34; MDBL&M  North Fork Garcia River (1113.700205) 
1-14-044  Mendocino  T21N, R17W, Sec. 3-6; MDBL&M  Juan Creek (1113.120103) 
1-14-053 Mendocino  T23N, R18W, Sec. 1; T23N, R17W, Sec. 6, 7; T24N, R17W, Sec. 31; MDBL&M  Mill Creek (1111.320401); Lower Usal Creek (1113.110101); Wildcat Creek (1111.320402) 
 1-14-051 Mendocino  T15N, R15W, Sec. 8, 15-17; MDBL&M  Lower South Branch Navarro River (1113.500502) 
 1-14-058 Mendocino  T17N, R17W, Sec. 1, 12; MDBL&M  Berry Gulch (1113.300402) 
 1-14-063  Mendocino T14N, R15W, Sec. 18, 19; T14N, R16W, Sec. 13; MDBL&M   Upper Greenwood Creek (1113.610003)
1-14-061  Mendocino  T19N, R16W, Sec. 26, 27, 34, 35; MDBL&M  Churchman Creek (1113.130302) 
1-14-044  Mendocino  T21N, R17W, Sec. 3-6; MDBL&M  Juan Creek (1113.120103) 
 1-14-067 Mendocino  T18N, R17W, Sec. 22; MDBLM  Mouth of Noyo River (1113.200403) 
1-14-064   Mendocino T21N, R16W, Sec. 15, 22, 23, 26; MDBL&M  Kenny Creek (1111.330302); Mud Creek (1111.330301) 
 1-14-069 Mendocino  T20N, R16W, Sec. 19, 20, 29, 30; MDBL&M  Bear Haven Creek (1113.130203) 
 1-14-072 Mendocino   T13N, R16W, Sec. 29; MDBL&M Lower Brush Creek (1113.640001) 
 1-14-078 Mendocino  T15N, R17W, Sec. 3; MDBL&M  Mouth of Navarro River (1113.500707) 
1-14-077  Mendocino  T15N, R14W, Sec. 18, 19; T15N, R15W, Sec. 13-16, 22-24; MDBL&M  Lower South Branch Navarro River (1113.500502); Middle South Branch Navarro River (1113.500501) 
 1-14-009  Mendocino T18N, R15W, Sec. 16, 21; MDBL&M  Olds Creek (1113.200102); North Fork Noyo River (1113.200105) 
1-14-076  Mendocino  T23N, R18W, Sec. 10, 11, 14, 15; MDBL&M Upper Usal Creek (1113.110102) 
 1-14-074 Mendocino  T18N, R14W, Sec. 29-32; MDBL&M  Upper North Fork Big River (1113.300305) 

THP Number

County

Location

CalWater Watershed ID

1-13-126 Napa T08N, R06W, Sec. 6; T08N, R07W, Sec. 1; MDB&M  Simmons Canyon (2206.500102)

THP Number

County

Location

CalWater Watershed ID

 2-14-024  Nevada T18N, R10E, Sec. 28, 29; MD B&M   Humbug Creek (5517.320304)
2-14-004   Nevada T16N, R09E, Sec. 13; MDBL&M  Buckeye Ridge (5516.340304) 
2-13-102 Nevada  T18N, R11E, Sec. 15, 16; MD B&M  Poorman Creek (5517.320102) 
 2-14-042 Nevada  T17N, R10E, Sec. 27, 32; MD BL&M  Burlington Ridge (5517.200104) 

THP Number

County

Location

CalWater Watershed ID

2-14-012 Plumas T20N, R07E, Sec. 2-4, 9, 10, 15, 16, 21; T21N, R07E, Sec. 9, 10, 13-16, 22-27, 34-36; T21N, R08E, Sec. 18, 19, 30, 31; MDBL&M  Middle Fall River (5518.320601); Rock Creek (5518.220101); Upper Sucker Run (5518.220202); Upper Fall River (5518.320603)

THP Number

County

Location

CalWater Watershed ID

 1-14-031  San Mateo T08S, R04W, Sec. 9, 10, 14-16; MDBL&M  Butano Creek (2202.400302) 

THP Number

County

Location

CalWater Watershed ID

 1-14-042 Santa Cruz  T10S, R01E, Sec. 10, 11; MDBL&M   Soquel Creek (3304.130101)

THP Number

County

Location

CalWater Watershed ID

2-14-032 Shasta  T38N, R02W, Sec.  16, 17; MD B&M Battle Creek (5505.230001); Pig Creek (5505.220104) 
2-14-044  Shasta  T36N, R01E, Sec. 6; T37N, R01W, Sec. 36; MD B&M Deep Creek (5526.150202) 
 2-14-055 Shasta  T37N, R04W, Sec. 1, 11-15, 23, 24; MD BL&M  Lower South Fork Sacramento River (5525.100104) 

THP Number

County

Location

CalWater Watershed ID

 2-14-016 Siskiyou  T41N, R05W, Sec. 29, 31, 32; MD BL&M  Dale Creek (1105.500601) 
 2-14-028 Siskiyou  T44N, R10W, Sec. 18; MDBL&M  Isinglass Creek (1105.410103) 
 2-14-017 Siskiyou  T16N, R07E, Sec. 10  Little Grider Creek (1105.310207) 

THP Number

County

Location

CalWater Watershed ID

1-14-005 Sonoma  T08N, R12W, Sec. 26, 35; MDBL&M  Black Mountain (1113.900002) 
1-14-047   Sonoma  T09N, R13W, Sec. 18; T09N, R14W, Sec. 13, 24; MDBL&M Stewarts Point (1113.850301) 

THP Number

County

Location

CalWater Watershed ID

 2-14-022  Trinity T37N, R07W, Sec. 15, 22-26, 35; T37N, R06W, Sec. 19, T36N, R07W, Sec. 1, 3; MD B&M Squirrel Gulch (1106.400701); Cedar Creek (1106.400710); Watson Creek (1106.400702)
 2-14-040 Trinity  T31N, R10W, Sec. 3, 4, 8-10, 15-17, 20-23, 29; MD B&M  North Fork Hayfork Creek (1106. 250202); Johnson Gulch (1106.310101); Duncan Creek (1106.250403) 

 

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.