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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. Th​ese 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.​

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THP Number

County

Location

CalWater Watershed ID

1-16-086​HumboldtT07N, R02E, Sec. 36; T06N, R02E, Sec. 1, 2, 12; HB&M​​​Long Prairie Creek (1109.200002)
1-16-011Humboldt​​T03S, R01E, Sec. 3; HB&M​Dry Creek (1112.300304)
1-16-099Humboldt​​T07N, R02E, Sec. 2, 10, 11, 13, 14, 23, 24; HB&M​Headwaters Little River (1108.200003); Toss-Up Creek (1107.200302)
1-16-081Humboldt​​T04S, R02E, Sec. 27, 33-35; T05S, R02E, Sec. 2-4, 9, 10; HB&M​Bridge Creek (1112.300101); Eubank Creek (1112.300102)
1-16-097Humboldt​T04N, R01E, Sec. 3-5, 8-10; HB&M​Cloney Gulch (1110.000102); Little Freshwater Creek (1110.000103); Ryan Slough (1110.000104)
1-16-013Humboldt​​T03S, R03E, Sec. 4; HB&M​Canoe Creek (1111.310102)

THP Number

County

Location

CalWater Watershed ID

1-15-083Mendocino​​T19N, R11W, Sec. 1, 4, 9-12, 14, 15; T20N, R12W, Sec. 25, 26; MDB&M​Thomas Creek (1111.620102); Crocker Creek (1111.710102); Lookout Creek (1111.710104)
1-16-009​Mendocino​T14N, R14W, Sec. 15, 21, 22; MDBL&M​Lower Indian Creek (1113.500402)​
1-16-090Mendocino​​T15N, R16W, Sec. 3, 4, 9, 10, 15, 16; MDB&M​Ray Gulch (1113.500706); Middle Fork Navarro River (1113.500703); North Fork Navarro River (1113.500704)
1-16-098Mendocino​T20N, R16W, Sec. 14, 22-26; MDB&M​​Vickanne (1113.130101)
1-16-063Mendocino​T15N, R14W, Sec, 1, 10-12, 14; T15N, R13W, Sec 7; MDBL&M​South Daugherty Creek (1113.300102); Upper Ackerman Creek (1113.310301)
1-16-103Mendocino​​T17N, R16W, Sec. 14, 15, 22, 23; MDB&M​Two Log Creek (1113.300406)
1-16-094Mendocino​​T11N, R15W, Sec. 12-14, 23, 24; T11N, R14W, Sec. 6, 7; MDBL&M​​Robinson Creek (1113.810002); Stewart Creek (1111.810001)
1-16-109Mendocino​​T21N, R17W, Sec. 12-14, 24; MDB&M​DeHaven Creek (1113.120201); Dutch Charlie Creek (1111.330304); Rider Gulch (1113.120202)

THP Number

County

Location

CalWater Watershed ID

1-16-079NapaT08N, R05W, Sec. 8; MDB&MConn Creek (2206.500305)

THP Number

County

Location

CalWater Watershed ID

2-16-025Plumas​ T28N, R10E, Sec. 27, 28, 33, 34; MD B&M Mt. Meadows Creek (5518.450300); Moonlight Pass (5518.450400); Upper Cooks Creek (5518.530302)
2-16-046Plumas​​T27N, R10E, Sec. 3-5; 8-10; 15, 16; MDB&M​Moonlight Pass (5518.450400); Upper Cooks Creek (5518.530302)
2-16-037Plumas​​T26N, R09E, Sec. 9, 10, 15, 16; MD B&M​Lone Wolf Creek (5518.530501)
2-16-052Plumas​​T26N, R09E, Sec. 5-7, 17-20, 30; T27N, R09E, Sec. 31, 32; MD B&M​Upper Wolf Creek (5518.530503); Lower Wolf Creek (5518.530501); Rush Creek (5518.510200); Soda Creek (5518.510104)
2-16-051​Plumas​​T29N, R05E, Sec. 23-27; T29N, R06E, Sec. 28-30, 32, 33; MD B&MLouse Creek (5518.440301); Stump Ranch (5518.440102); Willow Creek (5518.440303)​

THP Number

County

Location

CalWater Watershed ID

1-16-073Santa Cruz​​T10S, R01W, Sec. 8, 9, 16, 17; MDBL&M​Branciforte Creek (3304.120501)
1-16-010Santa Cruz​​T10S, R01W, Soquel Augmentation Projected Sec. 23-26; MDB&M​​Bates Creek (3304.130103)​
1-16-100​Santa Cruz​T10S, R01W, Sec. 1, 2; MDB&M​Soquel Creek (3304.130101)

THP Number

County

Location

CalWater Watershed ID

2-16-045Shasta​​T39N, R02W, Sec. 32, 33; T38N, R02W, Sec. 4, 5, 9, 16; MD B&M​Battle Creek (5505.230001)
2-16-056Shasta​​T38N, R04W, Sec. 22-27, 35, 36; MDB&M​Sweetbriar Creek (5525.100106); Tom Neal Creek (5505.220201); Lower Soda Creek (5525.210202)
2-16-058Shasta​​T37N, R06W, Sec. 11, 13, 15; T37N, R05W, Sec. 7; MD B&M​Upper Slate Creek (5525.100210); Baker Creek (1106.400302)

THP Number

County

Location

CalWater Watershed ID

2-16-039
SiskiyouT39N, R01W, Sec. 21, 27-29, 33; T39N, R01W; MDBL&MAngel Creek (5505.240702)
2-16-045​Siskiyou T39N, R02W, Sec. 32, 33; T38N, R02W, Sec. 4, 5, 9, 16; MD B&M​​ Battle Creek (5505.230001)
2-16-050Siskiyou​​​T48N, R09W, Sec. 21, 23, 25, 27, 29; MDB&M​Bear Creek (1105.350304); Trapper Creek (1105.350306)
2-16-067Siskiyou​​T45N, R09W, Sec. 15, 17, 21; MD B&M​​McKinney Creek (1105.350301); East Mill Creek (1105.410303); Barkhouse Creek (1105.350404)

THP Number

County

Location

CalWater Watershed ID

2-16-038​Trinity​T31N, R10W, Sec. 36; MD B&M​​Tate Creek (1106.310101)
2-16-058Trinity​T37N, R06W, Sec. 11, 13, 15; T37N, R05W, Sec. 7; MD B&MUpper Slate Creek (5525.100210); Baker Creek (1106.400302)

 

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 635 KB)
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. ​​​​

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