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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

4-15-012​AmadorT07N, R15E, Sec. 4, 5; MDBL&MCamp Creek (6532.600502)

THP Number

County

Location

​​​​​

CalWater Watershed ID

1-15-105Del Norte​T17N, R01E, Sec. 7, 8, 17-19; HB&M​(1103.110001)​
1-15-140Del Norte​T14N, R01E, Sec. 3, 4; T15N, R01E, Sec. 27, 33, 34; HB&M​Upper West Hunter Creek (1105.110802); North of Teds Ridge ​(1103.500001)
1-15-137Del Norte​T13N, R01E, Sec. 13, 23-26; HB&M​McGarvey Creek (1105.110806); Lower Turwar Creek (1105.110801)​

THP Number

County

Location

CalWater Watershed ID

4-15-016
El DoradoT11N, R12E, Sec. 25; T11N, R13E, Sec. 30; MDBL&MLong Canyon (2205.300105)

THP Number

County

Location

CalWater Watershed ID

1-15-100Humboldt​​T08N, R01E, Sec. 5-9; HB&M​(1108.100003)
1-​15-108Humboldt​T12N, R01E, Sec. 1; T12N, R02E, Sec. 5-7, 42; HB&M​​Tarup Creek (1105.110703); Ah Pah Creek (1105.110702)
1-15-109Humboldt​T04N, R01W, Sec. 15; HB&M​Lower Elk River (110.​000402)
1-15-113Humboldt​T05N, RE, Sec. 36; HB&M​Cow Creek (1106.210201); Mosquito Creek (1106.​210202); Bradford Creek (1107.300101)
1-15-114​HumboldtT02N, R01E, Sec. 21, 28, 30; HB&M​Cummings Creek (1111.210001)​
1-15-115Humboldt​T12N, R01E, Sec. 13, 14; T12N, R02E, Sec. 17-20, 29, 30, 39, 40; HB&M​Ah Pah Creek (1105.110707)​
1-15-110Humboldt​T06N, R03E, Sec. 15, 16, 21, 22; HB&M​​(1107.200102); (1107.300202)
1-15-112Humboldt​T06N, R01E, Sec. 2, 11, 14; T06N, R02E, Sec. 5, 6; T07N, R02E, Sec. 31, 32; ​HB&MSquaw Creek (1109.100105); Warren Creek (1109.100103​)
1-15-122Humboldt​​T04N, R01W, Sec. 15, 22; HB&MLower Elk River (1110.000402)​
1-15-128Humboldt​T06N, R01E, Sec. 2, 11, 14; T06N, R02E, Sec. 5, 6; T07N, R02E, Sec. 31, 32; HB&M​Canyon Creek (1109.200005); Lower South Fork Little River (1108.200001)​
1-14-029​Humboldt​T09N, R01E, Sec. 31; T08N, R02E, Sec. 8, 16, 17; HB&MMaple Creek (1108.100003)​
1-15-124Humboldt​​T07N, R01E, Sec. 3-5, 9, 10; HB&M(1108.200002)​
1-15-119Humboldt​​T04N, R04E, Sec. 6; T04N, R03E, Sec. 1-3; T05N, R03E, Sec. 34, 35; HB&M​Maple Creek (1109.300501); Boulder Creek (1109.300503)
1-15-142HumboldtT06N, R02E, Sec. 1-3, 10, 11; HB&M​Lupton Creek (1107.200102)​
1-15-138​Humboldt​T08N, R01E, Sec. 1, 23; T08N, R02E, Sec. 6, 7, 17; T09N, R01E, Sec. 36; T09N, R02E, Sec. 31; HB&M​Maple Creek (1108.100003)
1-15-133Humboldt​​T07N, R05E, Sec. 17; HB&M​Bremer Creek (1106.120201)
1-15-124​Humboldt​​T07N, R01E, Sec. 2, 3; T08N, R01E, Sec. 25-28, 33-36; T08N, R02E, Sec. 30, 31; HB&MLower South Fork (1108.700001); Bulwinkle Creek (1108.200002)​

THP Number

County

Location

CalWater Watershed ID

2-15-032LassenT28N, R11E, Sec. 7-10, 15, 16, 21; MD B&MWest Branch Lights Creek (5518.530201); Upper Willard Creek (8637.200301)

THP Number

County

​​​

Location

CalWater Watershed ID

1-15-094Mendocino​T19N, R17W, Sec. 9, 10, 14; MDBL&M​Campbell Creek (1113.130303); Little Valley Creek (1113.200501); Inglenook Creek (1113.200503)​
1-15-096Mendocino​T14N, R16W, Sec. 13, 14, 23, 24;​ MDBL&MUpper Greenwood Creek (1113.610003)​
1-15-118Mendocino​T18N, R16W, Sec. 21-23,26, 27; MDB&M​Brandon Gulch (1113.200301); Parlin Creek (1113.200302)​
1-15-107​MendocinoT12N, R15W, Sec. ​4, 9, 10, 15, 16; MDB&MLower South Fork Ten Mile (1113.130303); Middle South Fork Ten Mile (1113.130302)​
1-15-111Mendocino​​T19N, R15W, Sec. 4, 9; T19N, R16W, Sec. 1, 2, 11, 12; MDBL&MRedwood Creek (1113.130402); Upper South Fork Ten Mile River (1113.130304); Booth Gulch (1113.130201)​
1-15-117Mendocino​T17N, R16W, Sec. 32, 33; MDBL&M​Laguna Creek (1113.130401); Middle Albion Creek (1113.400001)​
1-15-003Mendocino​T21N, R17W, Sec. 21; MDBL&M​RIder Gulch (1113.120202)​
1-15-125Mendocino​​T17N, R17W, Sec. 1; T18N, R17W, Sec. 25, 26, 35, 36; T18N, R16W, Sec. 30, 31; MDB&M​Hare Creek (1113.200401)
1-15-120Mendocino​T18N, R16W, Sec. 24-26; T18N, R15W, Sec. 30; MDB&M​(1113.200301); (1113.300302)​

THP Number

County

Location

CalWater Watershed ID

1-15-116Santa Cruz​​​T08S, R03W, Sec. 20, 21, 28, 29; MDBL&MWaterman Creek (2202.400106)​
1-15-131​Santa Cruz​T10S, R02E, Sec. 29, 31, 32; MDBL&M​Browns Creek (3305.100101)

THP Number

County

Location

CalWater Watershed ID

1-15-116San Mateo ​​T08S, R03W, Sec. 20, 21, 28, 29; MDBL&M Waterman Creek (2202.400106)​

THP Number

County

Location

CalWater Watershed ID

2-15-071Shasta​T37N, R04W, Sec. 21-29, 33; MDB&M​Upper South Fork Sacramento River (5525.100105); Lower South Fork Sacramento River (5525.100104)​
2-15-076Shasta​T38N, R02E, Sec. 13, 14, 24, 25; MDBL&M​Cayton Creek (5526.310101); Clark Creek (5526.310103); Dry Creek (5526.430400)​
2-15-082​Shasta​T36N, R01W, Sec. 13; T36N, R01E, Sec. 7, 17, 18; MD B&MBush Bar (5526.150301); Deep Creek (5526.150202); Little Roaring Creek (5526.140202)​
2-15-083Shasta​​T37N, R04W, Sec. 19, 25, 30, 36; T36N, R05W, Sec. 7, 12, 13; MD B&M​North Salt Creek (5525.100209); Boulder Creek (5525.100203); North Fork Shotgun Creek (5525.100103)

THP Number

County

Location

CalWater Watershed ID

2-96-006Siskiyou​T39N, R04W, Sec. 25, 26; MD B&M​Upper Soda Springs (5525.210102)​
2-16-002Siskiyou​​T41N, R05W, Sec. 1, 12; T41N, R04W, Sec. 6, 7; T42N, R05W, Sec. 36; MD B&M​Beaughton 
Creek (1105.500604)

THP Number

County

Location

CalWater Watershed ID

2-15-001TehamaT31N, R03E, Sec. 36; T29N, R04E, Sec. 17; T31N, R01E, Sec. 9; T31N, R01W, Sec. 36; T35N, R08W, Sec. 18; ​​​​​MDBL&MBlue Lake Canyon (5507.120204); Nanny Creek (5507.120503); North Fork Bear Creek (5507.220103); Shingle Creek (5507.220101); Mule Creek (1106.400908) 

THP Number

County

Location

CalWater Watershed ID

2-15-057
TrinityT37N, R06W, Sec. 18, 29, 31; MDB&MWatson Creek (1106.400402)
2-15-063Trinity​Sec. ​29; 11, 13, 14 T34N, R08W, R09W, MD B&MBuckeye Creek (1106.401003); Mooney Gulch (1106.​401004); Stoney Creek (1106.400907)

THP Number

County

Location

CalWater Watershed ID

4-15-013​TuolumneT04N, R15E, Sec. 1, 11-14; T04N, R16E, Sec. 5-8; T05N, R16E, Sec. 32, 33; MDB&M​​Lower Griswold Creek (6534.410303); McCormick Creek (6534.500502)

 

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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