Forest & Watershed Geology Program (FWGP) Documents

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Tim​ber 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. Th ese 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 200​2) 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
2-16-081ButteSec. 7, T23N, R4E;
Sec.  1, 12, T23N, R3E;
Mosquito Creek (5521.300204)
THP # County Location CalWater Watershed ID
1-18-007Del NorteSec. 3-4, 8-10, 15-17, T13N, R2E;
Sec. 33-34, T14N, R2E;
Upper Turwer Creek (1105.110808);
Lower Turwer Creek (1105.110801);
Potato Patch Creek (1105.110509)
1-18-008Del NorteSec. 18-19, T17N, R1E;
Little Mill Creek (1103.110001)
THP # County Location CalWater Watershed ID
4-17-012El DoradoSec. 4-5, 8-9, T11N, R12E;
Sec. 15-16, 20-22, 27-34, T12N, R12E;
Gaddis Creek (1109.300202);
Lower Pilot Creek (5514.320101);
Slab Creek (5514.320106)
THP # County Location CalWater Watershed ID
1-12-026 HumboldtSec. 14, T1S, R1W;
NF Rainbow (1112.300604)
1-17-120 HumboldtSec. 7-9, 16-17, T12N, R2E;
Ah Pah Creek (1105.110702);
Tarup Creek (1105.110703)
1-17-142 HumboldtSec. 1-2, T1S, R1W;
Sec. 36, T1N, R1W;
Beer Bottle Creek (1112.200101)
1-18-001 HumboldtSec. 3, T5N, R1E;
Lower Jacoby Creek (1110.000503)
1-18-002 HumboldtSec. 26-27, 34-35, T7N, R2E;
Canyon Creek (1109.200005)
1-18-003 HumboldtSec. 4, 9-10, 14-15; T6N, R2E;
Sec. 32-34, T7N, R2E;
Denman Creek (1109.200001);
Pollock Creek (1109.200003);
Canyon Creek (1109.200005)
1-18-006 Humboldt & Del NorteSec. 29, 31-32, T13N, R2E;
Sec. 5-6, T12N, R2E;
Tarup Creek (1105.110703)
1-02NTMP-002 HumboldtSec. 10, 15, T6N, R1E;
Not specified
1-17-147 HumboldtSec. 22-24, 26-27, T11N, R2E;
Lower Tectah Creek (1105.110401);
Johnson Creek (1105.110402)
1-18-011 HumboldtSec. 5-8, 17, T1S , R2E;
Bear Creek (1111.120101)
1-18-004 HumboldtSec. 1-2, T5N, R1E;
Sec. 35, T6N, R1E
Lower Jacoby Creek (1110.000503);
Powers Creek (1109.100104)
1-14-153HumboldtSec. 16-17,​ T1N, R1W;
Howe Creek (1111.110101)
1-17NTMP-010HumboldtSec. 5, T3S, R3E;
Canoe Creek (1111.310102​)
1-18-016HumboldtSec. 2-3, 9-12, 15-16, T10N, R2E;
Sec. 35, T11N, R2E;
Mettah Creek (1105.110305);
Upper Tectah Creek (1105.110405)
1-18-017HumboldtSec. 31-33, T1S, R3E;
Sec. 4-5, T2S, R3E;
Poison Oak Creek (1111.410601);
Thompson Creek (1111.410602)
1-18-020HumboldtSec. 3-4, 8-10, 15-17, T13N, R2E;
Sec. 33-34, T14N, R2E;
Lower Larabee Creek (1111.130300);
Burr Creek (1111.130201)
1-18-026HumboldtSec. 26, T5N, R1E;
Freshwater Creek (1110.000102)
THP # County Location CalWater Watershed ID
​​1-17-133 MendocinoSec. 2, 10-13, T15N, R17W;
Cuffeys Point (1113.500707);
Navarro River (1113.610002)
​​1-17-141 MendocinoSec. 9-10, 15-16, T17N, R16W;
Two Log Creek (1113.300406);
Berry Gulch (1113.300402)
​​1-17-145 MendocinoSec. 27, 34-35, T21N, R17W;
Little North Fork (1113.130401);
Rider Gulch (1113.120202)
​​1-18NTMP-002MendocinoSec. 28, T18N, R17W;
Hare Creek (1113.200401)
and ​​​​Addendum​
MendocinoSec. 1, 12, T18N, R17W;
Little North Fork Noyo River (1113.200201)
​​1-15-088​MendocinoSec. 3-4, T22N, R17W;
Sec. 32-34, T23N, R17W;
Middle Hollow Tree Creek (1111.320301)
Sec. 3-4, ​T17N, R14W;
Sec. 33-34, T18N, R14W;
Baechtel Creek (1111.610101);
Martin Creek (1113.300201)
Sec. 9, 15-16, 21-22, ​T18N, R15W;
Olds Creek (1113.200102)
Sec. 12-13, T19N, R15W;
Hayworth Creek (1113.200103)
Sec. 24, T15N, R17W;
Mouth of Navarro River (1113.5​00707);
Cuffeys Point (1113.610002)
​​​​​ THP # County Location CalWater Watershed ID
2-17NTMP -003 NevadaSec. 9, T16N, R9E;
Little Deer Creek (5517.200102)
​​​ THP # County Location CalWater Watershed ID
2-18-006Placer​Sec. 34, T15N, R9E;
Campbell Creek (5516.330003)
​​​ THP # County Location CalWater Watershed ID
2-18-002 PlumasSec. 19-20, T24N, R11E;
Pine Creek (5518.520303)
THP # County Location CalWater Watershed ID
​​1-17-146 Santa CruzSec. 16, 21-22, T9S, R3W;
Big Creek (3304.110201 );
Scott Creek (3304.110204)
1-18-019Santa CruzSoquel Augmentation Rancho, T10S, R1W;
Soquel Augmentation Rancho, T11S, R1W;​
Aptos Creek (3304.130204)
1-18-023Santa CruzSec. 35, T9S, R1W;
Sec. 2, T10S, R1W;
West Branch Soquel Creek (3304.130105)
THP # County Location CalWater Watershed ID
2-17-080ShastaSec. 13, 23-25, 36, T36N, R1W;
Sec. 17-20, 30, T36N, R1E;
Little Roaring Creek (5526.140202)
Deep Creek (5526.150202);
Bush Bar (5526.150301);
Roaring Creek (5526.140203)
2-18-017ShastaSec. 29, 31, T36N, R4W;
Sec. 25-26, T36N, R5W;
Campbell Creek (5506.200209);
Lower Middle Salt Creek (5506.200201);
Upper Middle Salt Creek (5506.200210)
​THP # County Location CalWater Watershed ID
​​2-18-005YubaSec. 31, T19N, R07E;
Sec. ​4, 11, 20-22, 35-36, T19N, R06E;
Sec. 3-4, 9-11, 14-16, 20-22, 29, T18N, R06E;
Sec. ​35, T18N, R07E;
Sec. ​2, T17N, R07E;​
Frenchtown (5517.130201);
Daken Flat (5517.130101);
Honcut Creek (5517.600101);
Costa Creek (5517.130102);
McCabe Creek (5518.110503);
Ponderosa Reservoir (5518.220201);
Natchez Creek (5517.600103);
Robinson Ravine (5517.600102);
Willow Glen Creek (5517.130301)​

​​​ P o st-Fire Erosion and Slope Stability

California Geological Survey staff provi de advisory services to the Depart ment 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


O ther Documents Prepared by the CGS Forest & Watershed Geology Program

​​ Document Description
SR 217Special Report 217
Geologic Compilation of Quaternary Surficial Deposits in Southern California. Contains report and a comp lete GIS digital database for all 16 maps.

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.

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.