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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

2-16-014
ButteT26N, R04E, Sec. 14-16, 20-22, 25-31, 33, 36; MD B&MBolt Creek (5521.300101); Bull Creek (5521.300205); Coon Hollow (5518.600105); Cascade Creek (5509.140103)

THP Number

County

Location

CalWater Watershed ID

1-16-023Del Norte​​T13N, R01E, Sec. 15, 16, 21, 22; HB&MMcGarvey Creek (1105.110806)​
1-16-027​Del Norte​T13N, R02E, Sec. 6; T14N, R01E, Sec. 36; T14N, R02E, Sec. 19, 30, 31; HB&M​​Lower W. Fork Hunter Creek (1105.110803); Upper Turwar Creek (1105.110808); Hoppaw Creek (1105.110804); Lower Turwar Creek (1105.110801)

THP Number

County

Location

CalWater Watershed ID

1-16-017​​Humboldt​​T02S, R04E, Sec. 34, 35; T03S, R04E, Sec. 2, 3, 10, 11; HB&M​Basin Creek (1111.410401); Willow Creek (1111.410402)
1-12-001Humboldt​​T02N, R04E, Sec. 12, 13, 24; T02N, R05E, Sec. 7, 8, 17, 17-20; HB&M​Bear Creek (1109.300101); Olmstead Creek (1109.300301); Holm Creek (1109.300304)
1-16-008Humboldt​​T11N, R02E, Sec. 4, 5, 8, 9; T12N, R02E, Sec. 29, 30, 32; HB&MAh Pah Creek (1105.110702); Surpur Creek (1105.110704)​
1-15-130Humboldt​​T04N, R03E, Sec. 25, 26, 35, 36; HB&M​Graham Creek (1109.300403); Goodman Prairie Creek (1109.300404); Wilson Creek (1109.300402)
1-15-136​Humboldt​T05N, R04E, Sec. 26, 34, 35; HB&M​Twin Lakes Creek (1107.300103); Bradford Creek (1107.300101); Cow Creek (1106.210201)
1-16-025Humboldt​​T02N, R04E, Sec. 29-31; T02N, R03E, Sec. 25, 36; T01N, R04E, Sec. 4-6, 9; HB&M​(1111.220503); (1111.220502); 1111.220504)
1-16-036Humboldt​​T11N, R02E, Sec. 3-5, 40; T12N, R01E, Sec. 32-34; HB&M​Bear Creek (1105.110701); Ah Pah Creek (1105.110702); Surpur Creek (1105.110703)
1-16-030Humboldt​​T09N, R03E, Sec. 8, 9;HB&M​Lower Tully Creek (1105.110201)
1-15-129Humboldt​​T02N, R01E, Sec. 27-30, 32-34; HB&M​(1111.210002)
1-16-003Humboldt​​T04N, R02E, Sec. 3, 4, 9, 10; HB&M(​1109.300502)
1-16-032Humboldt​​T01S, R01E, Sec. 9, 16-19, 21, 28; T01S, R01W, Sec. 13, 24; HB&M(11​12.200101); (1112.200103)
1-16-029Humboldt​​T02S, R03E, Sec. 3, 11, 13, 24; HB&M​Cameron Creek (1111.410501); Thompson Creek (1111.410602)
1-16-039Humboldt​​T10N, R02E, Sec. 36; T09N, R02E, Sec. 1, 2; T09N, R03E, Sec. 6; HB&M​Upper Roach Creek (1105.110306)
1-16-042Humboldt​​T09N, R03E, Sec. 15, 16, 19-21, 28; HB&M​Upper Tully Creek (1105.110205); Lower Little Pine Creek (1105.110103); Upper Little Pine Creek (1105.110102); Snowcamp Creek (1105.110104)
1-16-041Humboldt​​T09N, R03E, Sec. 16-20; HB&M​Upper Tully Creek (1105.110205)
1-16-006Humboldt​​T03S, R04E, Sec. 10-15, 22-24; HB&M​Ohman Creek (1111.310103); Canoe Creek (1111.310102); Rocky Glen Creek (1111.320805)
1-15-121Humboldt​​​T01N, R01E, Sec. 1; T01N, R02E, Sec. 6; T02, R02, Sec. 31; T02N, R01E, Sec. 36; HB&MHely Creek (1111.210003)​

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)
2-15-081Lassen​​T35N, R07E, Sec. 25, 36; MD B&M​​Corders Reservoir (5526.440202)

THP Number

County

Location

CalWater Watershed ID

4-14-007
MariposaT05S, R21E, Sec. 23; MDBL&MRainier Creek (6537.400301)

THP Number

County

​​​

Location

CalWater Watershed ID

1-15-006
Mendocino​​T15N, R14W, Sec. 31; MDBL&M​Mill Creek (1113.500708)
1-16-015Mendocino​​T20N, R17W, Sec. 15, 16, 22; MDBL&M​​Little North Fork (1113.130401); Abalobadiah Creek (1113.130603)​
1-03-007Mendocino​​T18N, R15W, Sec. 5-8, 17, 18; T19N, R15W, Sec. 31; MDB&M​​Duffy Gulch (1113.200202); North Fork Noyo Rliver (1113.200105)
1-16-004Mendocino​​T13N, R16W, Sec. 28, 33; MD B&MLower Brush Creek (1113.500701); Lower Garcia Creek (1113.700206)​
1-16-013Mendocino​​T15N, R14W, Sec. 8-12, 15-17; T15N, R13W, Sec. 3, 11, 12, 31;  MDB&M​Upper South Branch Navarro River (1113.500503); Middle South Branch Navarro River (1113.500501)
1-16-031​Mendocino​T14N, R16W, Sec. 23-26, 36;  T13N, R16W, Sec. 1, 2; MDBL&M​Upper Elk Creek (1113.620002)
1-16-035Mendocino​​T18N, R15W, Sec. 13, 14, 23, 24; MDBL&M​​Olds Creek (1113.200102); James Creek (1113.300301)

THP Number

County

Location

CalWater Watershed ID

2-15-089
Plumas T21N, R08E, Sec. 9, 13, 14, 16, 22, 23, 27, 28, 34; MD B&M Post Creek (5518.220102); Valley Creek (5518.230002); Rock Creek (5518.220101); Lewis Flat (5518.230001)
2-15-080​Plumas​T28N, R08E, Sec. 26, 27, 34, 35; T27N, R07E, Sec. 1-3, 11, 12, 14; MD B&M​East Side Lake Almanor (5518.530503); Upper Wolf Creek (5518.530503)

THP Number

County

Location

CalWater Watershed ID

1-16-020Santa Cruz​ T08S, R03W, Sec. 16-22, 27-29; MDBL&M​​Waterman Creek (2202.400106); Slate Creek (2202.400101); Butano Creek (2202.400302)​
1-16-040Santa Cruz​​T11S, R01E, Aptos Rancho; MDB&M​Valencia Creek (3304.130201)

THP Number

County

Location

CalWater Watershed ID

1-15-116San Mateo ​​T08S, R03W, Sec. 20, 21, 28, 29; MDBL&M Waterman Creek (2202.400106)​
1-16-024San Mateo​​T08S, R03W, Sec. 14; MDBL&M​Waterman Creek (2202.400106)
1-16-020San Mateo​​T08S, R03W, Sec. 16-22, 27-29; MDBL&M Waterman Creek (2202.400106); Slate Creek (2202.400101); Butano Creek (2202.400302)​
1-16-016San Mateo​​T05S, R05W, Portions of Rancho San Mateo, Rancho Feliz, Rancho Pulgas, Rancho Buri-Vuri, Sec. 13; T05S, R04W, Sec. 18; T04S, R05W, Sec. 20; MDBL&MSan Andreas Lake (2204.400306); Lower Crystal Springs Reservoir (2204.400302); Upper Crystal Springs Reservoir (2204.400304)​

THP Number

County

Location

CalWater Watershed ID

2-15-084Shasta​​T38N, R01E, Sec. 25, 26, 35, 36; MD B&MCurtis (5526.160003)​
2-16-015Shasta​​T38N, R02W, Sec. 20, 21, 27-29; MD B&MLadybug Creek (5505.210102); Skunk Hill (5505.230004); Battle Creek (5505.230001)​

THP Number

County

Location

CalWater Watershed ID

2-15-088​Siskiyou
T47N, Sec. 4, 5, 8-10; T48N, R07W, Sec. 33, 34; MD B&M​West Fork Cottonwood Creek (1105.360302); Soda Springs (1105.360301)​
2-16-020​Siskiyou​T39N, R01W, Sec. 36; MD B&MTate Creek (5505.240704); Angel Creek (5505.240702)​

THP Number

County

Location

CalWater Watershed ID

1-15-007
SonomaT07N, R11W, Sec. 3, 4; T08N, R11W, Sec. 33, 34; MDB&M​Freezeout Creek (1114.110402)
1-16-034Sonoma​​T09N, R13W, Sec. 5-8; MD B&MMiddle South Fork Gualala River (1113.850103)​

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

1-15-008Trinity​T04S, R06E, Sec. 5-8; HB&M​​​TIcknov Creek (1111.420602); 201 Spur (1111.420606); Upper South Dobbyn Creek (1111.410103)​
2-11-004Trinity​​​T32N, R09W, Sec. 3, 5, 7-13, 15, 17, 21; T34N, R09W, Sec. 7, 18; MDBL&M​Lower Indian Creek (1106.310402); Tom Lang Gulch (1106.310403)
2-16-018Trinity​​T33N, R10W, Sec. 30, 31; T33N, R11W, Sec. 36; T32N, R11W, Sec. 1, 2, 11; MD B&M​Soldier Creek (1106.150703); Dutch Creek (1106.150701)

 

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. ​