Forest and Watershed Geology Documents

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 available for viewing on this web page 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: 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 webpage.

NOTE: The CGS THP library (this page) will remain operational until April 30, 2019. After that date, THP documents will only be available via CalTREES. To start using the CalTREES system immediately, click the CalTREES logo below.

CalTREES logo

ABOUT CALTREES: Timber harvest permitting in California is moving into a new era with the launch of CalTREES by CAL FIRE and the AB 1492 Timber Regulation and Forest Restoration Program. The CalTREES system streamlines the submission and review processes for timber harvesting plan (THP) documents. For more information, please visit the CalTREES Information Portal, the CalTREES FAQ web page, or email CalTREES Support.

THP # County Location CalWater Watershed ID
2-14-106Butte and PlumasSec. 24, T24N/R04E;
Sec. 9-10, 14-17, 21-23, 27-28, 32-34, T24N/R05E;
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
1-18-00175Del Norte

Sec. 13, T08N/R01E;
Sec. 7, 17-18, T08N/R02E;

Maple Creek (1108.100003)
1-19-00005Del Norte

Sec. 3, 9-10, 15, 22-23, 27-28, T14N/R01E;

Lower West Fork Hunter Creek (1105.110803;
High Prairie Creek (1105.110805);
Upper West Fork Hunter Creek (1105.110802);
North of Ted's Ridge (1103.500001)
1-18-00007 amendment 7Del Norte

Sec. 8, 17, T13N/R02E;

Upper Turwar Creek (1105.110808);
Lower Turwar Creek (1105.110801);
Potato Patch Creek (1105.110509)
1-18-00191Del Norte

Sec. 24-25, 36, T13N/R01E
Sec. 19-20, 30-32, T13N/R02E;

McGarvey Creek (1105.110806);
Tarup Creek (1105.110703)
1-18-00195Del Norte

Sec. 33, T19N/R01W;
Sec. 1-2, 9-12, 14-15, 23, T18N/R01W;

South Fork of the Winchuck River (1101.000001);
Gilbert Creek (1101.000002);
Dominie Creek (1103.11004)
1-18-00022Del Norte

Sec. 4, T18N/R01W;

South Fork of the Winchuck River (1101.000001);
Gilbert Creek (1101.000002)
THP # County Location CalWater Watershed ID
4-18-011El Dorado

Sec. 14-16, 21-22, T08N/R12E;

Farnham Creek (6532.240601);
John Schell Mine (6532.240603)
THP # County Location CalWater Watershed ID
Portions of Sect. 5, 9-10, 15-17, 22-23, T04N/R03E;
Barry Ridge (1109.300405);
Goodman Prairie (1109.300404);
Boulder Creek (1109.300503)
Portions of Sect. 10-11, 14-15, 23, T05N/R01E;
Lower Jacoby Creek (1110.000503);
Upper Jacoby Creek (1110.000504)
Sect. 12, T09N/R02E;
Sec. 5-8, T09N/R03E;
Sec. 28, 33, T10N/R03E;
Upper Roach Creek (1105.110306);
Upper Tully Creek (1105.110205);
Middle Roach Creek (1105.110301);
Lower Tully Creek (1105.110201);
Moreek Creek (1105.110303)
Portions of Sec. 7, T02N/R01E;
Strongs Creek (1111.110203)
Sec. 23-25, T10N/R02E;
Sec. 19, 30, T10N/R03E;
Upper Roach Creek (1105.110306);
Middle Roach Creek (1105.110301)
Sec. 26-27, 34, T11N/R02E;
Sec. 3, T10N/R02E;
Lower Tectah Creek (1105.110401);
Upper Tectah Creek (1105.110405)
Bridgeville FRPHumboldt
Sec. 11-15, T01N/R03E;
Sec. 7, T01N/R04E;
Not specified
Sec. 2-4, 10-11, T03N/R01E;
Upper South Fork Elk River (1110.000301);
Lower North Fork Elk River (1110.000201)
THP # County Location CalWater Watershed ID
1-18NTMP-00015MendocinoSec. 9, T16N/R15W;
Mettick Creek (1113.300103);
Upper Albion River (1113.400006)
1-18-00171MendocinoSec. 11-12, 14, T18N/R15W;
McMullen Creek (1113.200106);
Olds Creek (1113.200102)
1-18-00160MendocinoSec. 32-34, T13N/R15W;
Victoria Fork (1113.700103)
1-18-00127MendocinoSec. 22, 26-27, 34-35, T18N/R15W;
James Creek (1113.300301);
Chamberlain Creek (1113.300302)
1-18-095MendocinoSec. 4, 9-10, 14-15, 23, T11N/R15W;
Doty Creek (1113.810003)
1-18-00180MendocinoSec. 24-25, T17N/R16W;
Sec. 19, 30, T17N/R15W;
Two Log Creek (1113.300406)
1-19-00001MendocinoSec. 19, 30-31, T19N/R15W;
Sec. 36, T19N/R16W;
Upper South Fork Ten Mile River (1113.130304);
Duffy Gulch (1113.200202);
North Fork Noyo River (1113.200105)
1-19-00004MendocinoSec. 33-35, T19N/R17W;
Sec. 2-4, T18N/R17W;
Pudding Creek (1113.200508);
Virgin Creek (1113.200507);
Little Valley Creek (1113.200501);
Mill Creek (1113.200506)
1-19-00023MendocinoSec. 3-5, T14N/R15W;
Sec. 32, T15N/R15W;
Upper Navarro (1113.500701;
Floodgate Creek (113.500702)
1-19-00028MendocinoSec. 16, T19N/R17W;
Inglenook Creek (1113.200503);
Sand Hill Lake (1113.200504)
1-19-00029MendocinoSec. 31, T01S/R01E;
Sec. 5-8, 17, T02S/R01E;
Rattlesnake Creek (1112.300401);
Oil Creek (1112.300403)
1-18-00117MendocinoSec. 8-10, 15-18, T19N/R15W;
Middle Fork North Fork Noyo River (1113.200104);
Upper South Fork Ten Mile River (1113.130304)
1-18-093MendocinoSec. 6-7, T15N/R16W;
Sec. 1, 11-12, T15N/R17W;
Mouth of Navarro River (1113.500707);
Ray Gulch (1113.500706);
Big Salmon Creek (1113.400005)
1-19-00015MendocinoSec. 3-4, 8-10, 15, T22N/R17W;
Middle Hollow Tree Creek (1111.320301)
1-19-00018MendocinoSec. 20, 29, T12N/R16W;
Point Arena Creek (1113.700302)
1-19-00019MendocinoSec. 14-15, 22-23, T23N/R18W;
Lower Usal Creek (1113.110101)
THP # County Location CalWater Watershed ID
1-18-00179Santa CruzSec. 1-2, 11-12, 14 T10S/R03W;
San Vicente Creek (3304.110203)
1-17 NTMP-008Santa CruzSec. 24 T10S/R01E;
Sec. 19, T10S/R02E;                  
Corralitos Creek (3305.100102)
THP # County Location CalWater Watershed ID
2-18-026ShastaSec. 25, 35, 36, T36N/R04W;
Sec. 3, T35N/R04W;
Nawtawaket Creek (5506.200104);
Upper Salt Creek (5506.200206);
Lower Middle Salt Creek (5506.200201);
Upper Middle Salt Creek (5506.200210)
2-15-003 amendment 7ShastaSec. 34-35, T30N/R10W;
Chanchelulla Creek (1106.310105);
Harrison Gulch (5524.360301);
Knob Gulch (5524.360402)
THP # County Location CalWater Watershed ID
2-18-00147TrinitySec. 16, 19, 29-30, T04N/R08W;
Price Creek (1106.130103);
Treloar Creek (1106.130105);
Upper Corral Creek Gulch (1106.240201)

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.

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.