​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​F​​​orest & Watershed​ Geology Program ​(FWGP) ​Documents​​​​

​​To download a document on this page, right click on its link and select "Save target​ as...".

​​Note: Adobe Reader® is require​d to view most of the documents on this page. Click this button to download it, free of charge: ​
Download Adobe Reader

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 pa​rt of the THP review process.

Recently submitted THP engineering geologic review memoranda prepared by CGS staff are presented below. These memoranda are available for vi​ewing 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 co​py. For more information on the THP review process, go to CAL FIRE's web page.​

THP # County Location CalWater Watershed ID
4-17-013Calaveras​Sec. 13-16, 19-21, 24, 29, T7N, R14E;
Lower Panther Creek (5505.220101)
THP # County Location CalWater Watershed ID
1-17-108Del Norte​Sec. 17, 19-21, 29, 30, T18N, R1E;
Upper Roach Creek (1105.110306)​;
Upper Tectah Creek (1105.110405)
1-18-007Del Norte​Sec. 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 Norte​Sec. 18-19, T17N, R1E;
Little Mill Creek (1103.110001)
THP # County Location CalWater Watershed ID
4-17-012El Dorado​Sec. 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
1-17-116​​Humboldt​Sec. 3, 11-12, T3N, R1W;​
Sec. 7, T3N, R1E;
Lower South Fork Elk River (1110.000302)
1-17-110​​​Humboldt​Sec. 19, 30-31, T1N, R1E;​
Sec. 2-3, 11, 13-14, 24-25, T1N, R1W;
Monument Creek (1111.120201);
Howe Creek (1111.110001)
1-17NTMP-011​​​​Humboldt​Sec. 24, T2S, R3E;​ T11N, R2E;
​Elk Creek (1111.310101)
1-17-095​​​​Humboldt​Sec. 19, 30-31, T9N, R1E;​
​Pitcher Creek (1108.100001)
1-17-132​​​​Humboldt​Sec. 1-2, 24, T4N, R1E;​
Sec. 6, T4N, R2E;​
Upper Freshwater Creek (1110.000101);
Cloney Gulch (1110.000102)
1-17-138​​​​Humboldt​Sec. 10, T4N, R1E;​​
Little Freshwater Creek (1110.000103)
1-12-026​​​​Humboldt​Sec. 14, T1S, R1W;
NF Rainbow (1112.300604)
1-17-120​​​​​Humboldt​Sec. 7-9, 16-17, T12N, R2E;
Ah Pah Creek (1105.110702);
Tarup Creek (1105.110703)
1-17-142​​​​​Humboldt​Sec. 1-2, T1S, R1W;
Sec. 36, T1N, R1W;
Beer Bottle Creek (1112.200101)
1-18-001​​​​​Humboldt​Sec. 3, T5N, R1E;
Lower Jacoby Creek (1110.000503)
1-18-002​​​​​Humboldt​Sec. 26-27, 34-35, T7N, R2E;
Canyon Creek (1109.200005)
1-18-003​​​​​Humboldt​Sec. 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​​​​​Humboldt​Sec. 10, 15; T6N, R1E;​
Not specified
​THP # County Location CalWater Watershed ID
1-17-12​6Lake​Sec. ​6-8, T11N, R7W;
​Sec. ​2-3, 11-13, T11N, R8W;
​Sec. ​35, T12N, R8W;​
Big Canyon Creek (5512.300105);
Upper Kelsey Creek (5513.550103);
Hoodoo Creek (5512.300102);
Anderson Creek (5512.300101)
​THP # County Location CalWater Watershed ID
1-17-114Mendocino​Sec. ​11-14, T19N, R15W;
Hayworth Creek (1113.200103)​;
Sherwood Creek (1111.610201)
1-17-109Mendocino​Sec. ​11, T12N, R16W;
North Fork Garcia River (1113.700205);
Rolling Brook (1113.700204)
1-03NTMP-007Mendocino​Sec. ​5-8, 17-18, T18N, R15W;
Sec. 31, T19N, R15W;
Duffy Gulch (1113.200202);
North Fork Noyo River (1113.200105)
1-17-106Mendocino​Sec. ​5-7, T24N, R17W;
McCoy Creek (1111.320505)
1-17-072Mendocino​Sec. ​7-8, 17-18, T18N, R16W;
Sec. ​11-14​, T18N, R17W;​
Little North Fork Noyo River (1113.200201);
Kass Creek (1113.200303)
​​1-17-104​Mendocino​ & SonomaSec. 20-21, 28-31, T11N, R14W;
​Big Pepperwood Creek (1113.850201);
Lower Rockpile Creek (1113.820003)
​​1-17NTMP-009MendocinoSec. 3-4, T17N, R14W;
Sec. 33-34, T18N, R14W;​
​Baechtel Creek (1111.610101);
Martin Creek (1113.300201)
​​1-17-101​MendocinoSec. 7-9, 16-18, T21N, R16W;
​Dutch Charlie Creek (1111.330304)
​​1-17-128​MendocinoSec. 18-20, 29, T17N, R15W;
Sec. 24, T17N, R16W;
​Lower North Fork Big River (1113.300304);
Two Log Creek (1113.300406)​
​​1-17-123​MendocinoSec. 24-26, 36, T12N, R16W;
Sec. 30-31, T12N, R15W;
Sec. 5, T11N, R15W;​
​Rolling Brook PWS (1113.700204);
South Fork Garcia River (1113.700203)​
​​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)
​​​ ​​THP # County Location CalWater Watershed ID
2-1​7NTMP​-003​Nevada​Sec. ​9, T16N, R9E;
Little Deer Creek (5517.200102)
​​​ ​​​THP # County Location CalWater Watershed ID
2-1​7-075​Plumas​Sec. ​3, 10, T27N, R6E;
​Sec. ​15-16, 22, 27, 32-35, T28N, R6E;​
Soldier Creek (5518.430401);
Upper Coyote Flat (5518.430402);
Johnson Creek (5518.440302)
THP # County Location CalWater Watershed ID
1-17-102​​Santa Cruz​Sec. 1, 6-7, T9S, R3W;
​​Castle Rock Falls (3304.120102)
1-17-117​​​Santa Cruz​Sec. 27, 34-35, T10S, R1E;
​​Corralitos Creek (3305.100102)
1-17-146​​​Santa Cruz​Sec. 16, 21-22, T9S, R3W;
​​Big Creek (3304.110201​);
Scott Creek (3304.110204)
THP # County Location CalWater Watershed ID
2-17-070​Shasta​Sec. 13, 24-25, T30N, R2E;
Sec. 15-22, 27-29, 33-35, T30N, R3E;
Upper Digger Creek (5507.120402)
2-17-072​Shasta​Sec. 9, 15, 17, T38N, R2E;
Upper Bear Creek (5526.430302);
Curtis (5526.160003);
Clark Creek (5526.310103)
2-17-074​​Shasta​Sec. 4-5, T35N, R1E;
Sec. 28, 33, T36N, R1E;
Roaring Creek (5526.140203);
Hall Creek (5526.140201)
2-17-077​​Shasta​Sec. 26-28, 33-35, T34N, R1E;
Lookout Mountain (5507.330103)
THP # County Location CalWater Watershed ID
​​1-17-104​​Sonoma & MendocinoSec. 20-21, 28-31, T11N, R14W;
​Big Pepperwood Creek (1113.850201);
Lower Rockpile Creek (1113.820003)
THP # County Location CalWater Watershed ID
​​1-17-100Trinity​Sec. 11-12, T2S, R7E;
​Hetten Creek (1109.400302);
Tompkins Creek (1109.400201)
​​2-17-060Trinity​Sec. 6-7, T33N, R8W;
Sec. 1, 3, 10-11, T33N, R9W;
Sec. 14-15, 23, 25, 35-36, T34N, R9W;
​Upper Rush Creek (1106.310602);
Lower Rush Creek (1106.310603);
Buckeye Creek (1106.401003);
Tom Lang Gulch (1106.310403);
Little Browns Creek (1106.320002)
​​2-17-063Trinity​Sec. 7, 9, 17, T38N, R7W;
​Eagle Creek (1106.400201);
Big Bear Lake (1106.400203)
​​2-17-043Trinity​Sec. 21, 23, 25, 27, T33N, R10W;
​Lower Weaver Creek (1106.320003);
Dutton Creek (1106.310201);
Soldier Creek (1106.150703)

​​​​​​​P​​o​st-Fire Erosion a​nd Slope Stability

California Geological Survey staff provi​​de 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 Form​California 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. ​​​​​​​