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

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Tim​​​ber ​Harvest Plan Eng​​​ineeri​ng 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 copy. For more information on the THP review process, go to CAL FIRE's web page.​

THP Number

County

Location

CalWater Watershed ID

4-16-008CalaverasSec. 16, T7N, R16E;
MDB&M
Moore Creek (2206.500301)

THP Number

County

Location

CalWater Watershed ID

1-17-062​Del Norte​Sec. 2, 3, 10, 11, T13N, R1E;
Sec. 35, 36, T14N, R1E;
HB&M
Lower W. Fork Hunter Creek (1105.110803);
Hoppaw Creek (1105.110804)​
1-17-073 ​Del Norte ​Sec. 5-9, 16, T14N, R1E;
Sec. 29-32, T15N, R1E;
HB&M
​North of Ted's Ridge (1103.500001)

THP Number

County

Location

CalWater Watershed ID

4-17-006 El DoradoSec. 31, T13N, R11E;
MDB&M
Canyon Creek (1109.200005) and Traverse Creek (5514.320302)
4-16-007 El Dorado​Sec. 1, T12N, R11E;
Sec. 2-4, 9-11, 14-16, T12N, R12E;
Sec. 25, T13N, R11E;
Sec. 31-34, T13N, R12E;
MDB&M
Brass Creek (5514.320206);
Gaddis Creek (5514.320106);
Little Grizzly Canyon (5514.430301);
Lower Pilot Creek (5514.430401);
Missouri Canyon (5514.410200);
Upper Pilot Creek (5514.430402);
Whaler Creek (5514.320202);
and Zero Spring (5514.430303)​

THP Number

County

Location

CalWater Watershed ID

1-17-053 HumboldtSec. 32, 33, T12N, R2E;
Sec. 4, 5, 8, 9, T11N, R2E;
HB&M​
​Ah Pah Creek (1105.110704);
Surpur Creek (1105.110704)
1-17-057 Humboldt​Sec. 2, 3, 10, 11, 14-16, T11N, R2E;
Sec. 34, T12N, R2E;
Sec. 3, T10N, R2E;
HB&M
Surpur Creek (1105.110704); ​
1-17-060Humboldt​​Sec. 20-23, 26, 36, T9N, R1E;
Sec. 31, T2N, R1E;
HB&M
​Pitcher Creek (1108.100001)
1-15-001Humboldt​​Sec. 1, 2, 12, T4N, R1W;
Sec. 5-8, T4N, R1E;
HB&M
​McWhinney Creek (1110.000104)
1-17-064Humboldt​​Sec. 3, 4, 11, T8N, R1E;
Sec. 27, 33, 34, T9N, R1E;
HB&M
Pitcher Creek (1108.100001)​
1-17-065Humboldt​​Sec. 17-20, T12N, R2E;
HB&M
​Ah Pah Creek (1105.110702)
1-17-069Humboldt​​Sec. 23, T7N, R1E;
HB&M
​​Mather Creek (1109.100106)
1-17-008Humboldt​​Sec. 17-20, T12N, R2E;
HB&M
​​Root Creek (1111.220604);
Stevens Creek (1111.220603)

THP Number

County

Location

CalWater Watershed ID

2-16-087LassenSec. 5, 6, T28N, R10E;
Sec. 22-27, 36, T29N, R9E;
Sec. 19, 20, 29-32, T29N, R10E;
MDB&M
Upper Goodrich Creek (5518.450201);
Coppervale Station (5518.450202)

THP Number

County

Location

CalWater Watershed ID

​​1-17-004Mendocino​Sec. 10, 15, T18N, R15W;
MDB&M
​Olds Creek (1113.200101)
1-17-046Mendocino​Sec. 33, T14N, R15W;
MDB&M
​Upper Elk Creek (1113.620002);
Lower Rancheria Creek (1113.500203)
1-17-051Mendocino​Sec. 13, 23-25, T17N, R15W;
Sec. 19, 20, 30, T17N, R14W;
MDB&M
​East Branch North Fork Big River (1113.300303);
Russell Brook (1113.300202)
1-17-052 Mendocino​Sec. 21, T16N, R17W;
MDB&M
​Albion River (1113.400004);
Lower Albion River (1113.400003)
1-17-059MendocinoSec. 1, T23N, R18W;
Sec. 30, 31, T24N, R18W;
Sec. 36, T24N, R18W;
MDB&M​
​Wildcat Creek (1111.320402)
1-17-056 Mendocino​Sec. 19, 30, T22N, R17W;
Sec. 24, 25, T22N, R18W;
MDB&M
​Cottaneva Creek (1113.120101);
Hardy Creek (1113.120102)
1-17-063Mendocino​Sec. 2-4, 10, T15N, R16W;
Sec. 26, 34, 35, T16N, R16W;
MDB&M
​Flynn Creek (1113.500705)
1-17-074 MendocinoSec. 25-28, 33-35, T15N, R14W;
MDB&M​
Upper South Branch Navarro River (1113.500401);
North Fork Indian Creek (1113.500401)​
1-17-078 MendocinoSec. 1-3, 11, 34-36; T11N, R14W;
MDB&M​
​Stewart Creek (1113.81001);
Middle Rockpile Creek (1113.820001);
Billings Creek (1113.810004)
1-17-081 MendocinoSec. 1, T15N, R14W;
Sec. 6, T15N, R13W;
Sec. 31, T16N, R13W;
Sec. 36, T16N, R14W;
MDB&M​
Upper Ackerman Creek (1114.310301)

THP Number

County

Location

CalWater Watershed ID

1-13-126NapaSec. 6, T8N, R6W;
Sec. 1, T8N, R7W;
MDB&M
Simmons Creek (2206.500102)

THP Number

County

Location

CalWater Watershed ID

2-17-012NevadaSec. 23, T17N, R10E;
Sec. 13, 21, 23, T17N, R11E;
MDB&M
Scotchman Creek (5517.320202);
Diamond Creek (5517.340302);
Fuller Lake (5517.340303);
Upper Steephollow Creek (5516.340202)
2-17-026NevadaSec. 15, T18N, R11E;
MDB&M
South Fork Poorman Creek (5517.320101);
Poorman Creek (5517.320102)

THP Number

County

Location

CalWater Watershed ID

2-17-028Placer Sec. 8, T15N, R10E;
MDB&M
Lower Steephollow (5516.340201)

THP Number

County

Location

CalWater Watershed ID

THP Number

County

Location

CalWater Watershed ID

1-98-022Santa Cruz​Rancho Salsipuedes, T10S &11S, R2E;
MDB&M
​​Browns Creek (3305.100101);
Hughes Creek (3305.100302)
1-17-071Santa Cruz​Sec. 4, 5, 8; T10S, R1W;
MDB&M
​​Bean Creek (3304.120401);
Carbonera Creek (3304.120504)

THP Number

County

Location

CalWater Watershed ID

2-00-006​Shasta​Sec. 22, 23, 26-28, T37N, R3W;
MDB&M
​Tom Dow Creek (5505.220202);
Ladybug Creek (5505.210102);
Oak Creek (5505.210204)
2-16-075Shasta​​Sec. 1-5, T33N, R1E; Sec 32-35, T34N, R1E;
MDB&M
​Lookout Mountain (5507.330103);
Mill Creek (5507.330102)
2-16-077Shasta​​Sec. 14, 21-23, 27, 28, T34N, R1E;
MDB&M
​Cedar Creek (5507.330201);
Upper Montgomery Creek (5526.130003);
Lookout Mountain (5507.330103)
2-17-017​Shasta​Sec. 5, T34N, R1W;
MDB&M
​Bear Canyon (5506.200602)
2-16-069Shasta​​​Sec. 3, 4, 8-10, 16-18, T38N, R1W;
Sec. 32-34, T39N, R1W;
MDB&M
​​Star City Creek (5505.230002);
Devils Canyon (5526.160001);
Hawkins Creek (5505.230003)
2-16-057 Shasta​Sec. 7, 18, 19, T38N, R2E,
MDB&M​
​​Curtis (5526.160003)
2-17-021​ShastaSec. 23, 24, 26, T34N, R1W,
MDB&M​​
Curtis (5526.160003); Devils Canyon (5526.160001)​
2-16-056​ShastaSec. 22-27, 35, 36, T38N, R4W;
MDB&M
Sweetbrier Creek (5525.100106) Tom Neal Creek (5505.220201) Lower Soda Creek (5525.210202)​
2-12-034Shasta​Sec. 7, 8, T38N, R1W;
Sec. 13, 23, 24, T38N, R2W;
MDB&M​
Starlight Creek (5505.230002);
Hawkins Creek (5505.230003);
Battle Creek (5505.230001)​​
2-17-023Shasta​Sec. 1, 11, 12, T31N, R2E;
​Sec. 36, T32N, R2E;
Sec. 4-8, T31N, R3E;
Sec. 31-33, T32N, R3E;
MDB&M​
Bridges Creek (5507​.120101)​​
2-15-053Shasta​Sec. 10-15, T38N, R1E;
MDB&M​
Devils Canyon (5526​.160001);
Curtis (5526.160003)​​​

THP Number

County

Location

CalWater Watershed ID

2-17​-022SierraSec. 25, 26, 35, T21N, R13E;
Sec. 19, T21N, R14E;
MDB&M
Sattley (5518.350502);
Upper Sulphur Creek (5518.350602)

​THP Number

County

Location

CalWater Watershed ID

2-15-067​SiskiyouSec. 2-3, 10-11, 15-16; T39N, R4W;
Sec. 33; T40N, R4W;
MDB&M
Ney Springs Creek (5525.220203);
Big Canyon Creek (5525.220304)

​THP Number

County

Location

CalWater Watershed ID

1-12-040SonomaSec. 7, 8, 17; T7N, R11W;
MDB&M
Willow Creek (1114.110401)
1-17-049​SonomaGerman Rancho, T10N, R15W; T11N, R15W;
MDB&M.
​Blackpoint (1113.850304)​

THP Number

County

Location

CalWater Watershed ID​

2-14-040Trinity​​Sec. 3, 4, 8-10, 15-17, 20-23, 29, T31N, R10E;
MDB&M
North Fork Hayfork Creek (1106.250202);
Johnson Creek (1106.310101);
Duncan Creek (1106.250403)​
2-16-088​Trinity​Sec. 3, T35N, R7W;
Sec. 7, 19, T36N, R6W;
Sec. 1, T36N, R7W;
MDB&M
​​Cedar Creek (1106.400710);
Nelson Creek (1106.400702);
Hay Gulch (1106.400808)
2-16-080Trinity​Sec. 24, T31N, R9W;
Sec. 9, 16-20, 30, T31N, R8W;
MDB&M​
​Upper Readings Creek (1106.310302)

P​​ost 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

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

​​O​​ther 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. ​​​​

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