​​​Forest and Watershed Geology Documents

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Timber Harvest Plan Geologic Reviews

CGS staff conduct engineering geologic field reviews of select Timber Harvesting Plans (THP) as part of a multi-agency review team led by the California Department of Forestry and Fire Protection (CAL FIRE). 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 CAL FIRE, 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@conservation.ca.gov and we will email a PDF if available (THPs beginning in 2002) or direct you to CAL FIRE for a hard copy. For more information on the THP review process, go to CAL FIRE's web page.

THP # County Location CalWater Watershed ID
2-14-106Butte and PlumasSec. 24, T24N/R4E;
Sec. 9-10, 14-17, 21-23, 27-28, 32-34, T24N/R5E;
MDB&M
North Valley Creek (5518.420301);
Swamp Creek (5518.420402);
Lockerman Creek (5518.420502);
Crane Valley (5518.600104);
Big Kimshaw Creek (5518.600204)
THP # County Location CalWater Watershed ID
1-18-071Del NorteSec. 5-7, T17N/R1E;
HB&M
Little Mill Creek (1103.110001)
Savoy Creek (1103.120002)
THP # County Location CalWater Watershed ID
4-18-002El DoradoSec. 14-16, 20-23, T8N/R14E;
MDB&M
Sopiago Creek (6532.240300)
4-18-005El DoradoSec. 17-20, T12N/R11E;
Sec. 13, T12N/R10E;
MDB&M
Bear Creek (1105.110701)
Traverse Creek (5514.320302)
4-18-008El DoradoSec. 13, T08N/R13E;
Sec. 13, T12N/R10E;
MD B&M
Sopiago Creek (6532.240300)

THP # County Location CalWater Watershed ID
1-09NTMP-008HumboldtSec. 22, T1N/R2W;
HB&M
South Fork Bear River (1112.200205)
1-18NTMP-007HumboldtSec. 33, T5N/R3E;
HB&M
Boulder Creek (1109.300503);
Maple Creek (1109.300501)
1-18-041HumboldtSec. 3, T4N/R2E;
HB&M
Blue Slide Creek (1109.300502)
1-18-059HumboldtSec. 11-13, T12N/R1E;
Sec. 7, 18, 40-41, T12N/R2E;
HB&M
Ah Pah Creek (1105.110702);
Tarup Creek (1105.110703)
1-17-125HumboldtSec. 1, 2, 12, T1N/R1E;
HB&M
Cummings Creek (1111.210001);
Hely Creek (1111.210003)
1-18-063HumboldtSec. 24-25, T11N/R2E;
Sec. 19, 29-30, T11N/R3E;
HB&M
Johnson Creek (1105.110402);
Mettah Creek (1105.110305)​
1-18-065​HumboldtSec. 10, T4N/R1E;
HB&M
McWhinney Creek (1110.000103)
1-18-073​HumboldtSec. 13, T2N/R1E;
Sec. 7, 16, 18, 21, T2N/R2E;
HB&M
(1111.230301);
(1111.230302);
(1112.210001);
(1111.230303)
1-13-063​HumboldtSec. 23, 26, 34-36, T2N/R2W;
HB&M
(1111.110303);
(1111.110102);
(1112.100002)
1-18NTMP-012​HumboldtPortions of Sections 21, T3S/R3E;
HB&M
Canoe Creek (1111.310102);
South Fork Salmon Creek (1111.310202);
1-18-077​HumboldtSec. 14, 15  T1N/R1W;
HB&M
Howe Creek (1111.110101);

1-18-079​HumboldtSec. 35  T3N/R1W;
HB&M
Palmer Creek (1111.110202);

1-18-084​Humboldt Portions of Sections 7, 8, 16, 17, 18,
 20, 21, 28, 29, 
T6N/R3E;
HB&M
Lupton Creek (1107.200102);
Noisy Creek (1107.300201);
Upper Cannon  Creek (1109.300603);
Pollock Creek (1109.200003);
Long Prairie Creek (1109.200002);
THP # County Location CalWater Watershed ID
1-18NTMP-008MendocinoSec. 16, T14N/R14W;
MDB&M
Lower Indian Creek (1113.500402)
1-18-024MendocinoSec. 3, 10, 11, 14, 15, T22N/R17W;
MDB&M
Upper Hollow Tree Creek (1111.320303);
Middle Hollow Tree Creek (1111.320301)
1-18-045MendocinoSec. 2, 3, 4, 9, T18N/R15W;
Sec. 32, T19N/R15W;
MDB&M
North Fork Noyo River (1113.200105)
1-18-050MendocinoSec. 9, 10, 14, 15, 22, T18N/R17W;
MDB&M
Mouth of Noyo River (1113.200403)
Kass Creek (1113.200303)
1-18-054MendocinoSec. 20, 21, T23N/R17W;
MDB&M
Lower Hollow Tree Creek (1111.320302)
1-18-060MendocinoSec. 10-16, 21-22, T17N/R14W;
MDB&M
Martin Creek (1113.300201)
1-18NTMP-010MendocinoSec. 1, T16N/R16W;
MDB&M
Upper Albion River (1113.400006)
1-18-014MendocinoSec. 22, 25, 26, 27,34;
T21N/R16W;
MDBL&M
Mud Creek (1111.330301)
1-18-067MendocinoSec. 30, 31; T15N/R16W;
MDBL&M
Lower Greenwood Creek (1113.610001)
1-18-049MendocinoSec. 25, 26, 35, 36; T19N/R17W;
MDBL&M
Pudding Creek (1113. 200508)
THP # County Location CalWater Watershed ID
2-18-034NevadaSec. 1, T17N/R09E;
Sec. 3, 4, 5, 7, T17N/R10E;
Sec. 25, 27, 34, 35,  T18N/R10E;
MDB&M
Humbug Creek (5517.320304);
Roscoe Creek (5517.320201)
South Fork Poorman Lake (5517.320101);
Squirrel Creek (5517.420203)
2-17-068NevadaSec. 25, T19N/R12E;
Sec. 19, 29, 31, T19N/R13E;
MDB&M
Jackson Meadow Reservoir (5517.430002);
Bowman Lake (5517.330001);
English Meadow (5517.430001);
East Fork Creek (5517.420101)
2-18-042NevadaSec. 11, T16N/R9E;
MD B&M
Little Deer Creek (5517.200102)
THP # County Location CalWater Watershed ID
2-18-030PlumasSec. 12, 13, T26N/R09E;
MDB&M
Lower Wolf Creek (5518.530501);
Hough Creek (5518.530403)
2-14-106Plumas and Butte​Sec. 24, T24N/R04E; MDB&M
Sec. 9-10, 14-17, 21-23, 27-28, 32-34,
T24N/R05E;
MDB&M
North Valley Creek (5518.420301);
Swamp Creek (5518.420402);
Lockerman Creek (5518.420502);
Crane Valley (5518.600104);
Big Kimshaw Creek (5518.600204)
THP # County Location CalWater Watershed ID
1-18-051San MateoSec. 11-14, T8S/R4W;
MDB&M
Butano Creek (2202.400302)
THP # County Location CalWater Watershed ID
1-18-040Santa CruzSec. 10, 11, T9S/R3W;
MDB&M
Boulder Creek (3304.120203)
1-18-047Santa Cruz Soquel Augmentation Rancho, T10S/R1W;
MDB&M
Soquel Creek (3304.130101)
1-18-052Santa Cruz Soquel Augmentation Rancho, T10S/R1W;
Soquel Augmentation Rancho, T11S/R1W;
MDB&M
Bates Creek (3304.130103)
THP # County Location CalWater Watershed ID
2-18-026ShastaSec. 25, 35, 36, T36N/R4W;
Sec. 3, T35N/R4W;
MDB&M
Nawtawaket Creek (5506.200104);
Upper Salt Creek (5506.200206);
Lower Middle Salt Creek (5506.200201);
Upper Middle Salt Creek (5506.200210)
2-18-032ShastaSec. 20, 21, 29, T38N/R2W;
MDB&M
Battle Creek (5505.230001);

2-18-036ShastaSec. 28, 32, 33, T39N/R01W;
MDB&M
Battle Creek (5505.230001);
Star City Creek (5505.230002);
Angel Creek (5505.240702);
THP # County Location CalWater Watershed ID
2-14-099SiskiyouSec. 19, T48N/R08W;
MDB&M
Deer Creek (1105.350301);
Soda Creek (1105.350302)
2-18-033SiskiyouSec. 15, 21, 22, 27, 29, 33, T39N/R01E;
MD B&M
Bull Creek (5505.240201);
Dead Horse Creek (5505.240202);
Racoon Creek (5505.240302)
THP # County Location CalWater Watershed ID
1-18-076SonomaSec. 17, 20, T9N/R13W;
MDB&M
Middle South Fork Gualala River(1113.850103);

THP # County Location CalWater Watershed ID
4-18-004TuolumneSec. 33, T2N/R17E;
MDB&M
Basin Creek (1105.420605);
Cottonwood Creek (1111.410401)
THP # County Location CalWater Watershed ID
2-18-025TrinitySec. 3, 4, 17, 21, T35N/R8W;
MDB&M
Strope Creek (1106.400807);
Davis Creek (1106.400802);
East Fork Stuart Glunch (1106.400801)

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
ArticleCalifornia Fires, Floods, and Landslide, 2005
PowerPointCalifornia Debris Flows & The Effects of Fire, 2005
California Geology ArticleFire and Rain Equal Mudflows, Big Sur 1972
California Geology Article
Hazard Evaluation Following the Tunnel (Oakland Hills) Fire, Oct 19-23, 1991
Burn Site FormCalifornia Geological Survey Burn Site Evaluation Form

More Documents Prepared by the CGS Forest and Watershed Geology Program

Document Description
SR 217Special 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.

MemorandaRegional Geologic Information and Preliminary Geomorphic Characterization of Bear Creek at Quigley Grove, Humboldt County, California. Dated February 24, 2003.

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
SP 120 Errata

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.