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THP Engineering Geologic Reviews

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

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THP Number

County

Location

CalWater Watershed ID

1-16-006​Del Norte​T17N, R01E, Sec. 19, 20, 29, 32; HB&M​Little Mill Creek (1103.110001)
1-1​7-043Del Norte​​Sec. 31-33, T19N, R1E; Sec. 4-6, T18N, R1E; HB&M​​Upper Bear Creek (1101.000003)

THP Number

County

Location

CalWater Watershed ID

4-16-006
El DoradoSec. 9, T8N, R13E; MD BL&MCedar Creek (1105.120202); Sopiago Creek (6532.240300)
4-17​-005 El Dorado​​Sec. 13, 14, T10N, R11E; MD B&M​China Creek (1105.320404); South Fork Weber Creek (5514.310101)​

THP Number

County

Location

CalWater Watershed ID

1-17-024​Humboldt​T04N, R01E, Sec. 1, 2; T04N, R02E, Sec. 6; T05N, R01E, Sec. 35, 36; T05N, R02E, Sec. 31; HB&M​Upper Freshwater Creek (1110.000101); Cloney Gulch (1110.000102); Upper Jacoby Creek (1110.000504)
1-17-018​Humboldt​T01S, R01E, Sec. 10, 15; HB&M​Chad Creek (1111.120102)
1-17-032​Humboldt​T07S, R01E, Sec. 25, 26; HB&M​Mother Creek (1109.100106)
1-17-028​Humboldt​T04S, R03E, Sec. 4, 5, 8, 9; HB&M​Seely Creek (1111.320802)
1-17-035Humboldt​​T05N, R02E, Sec. 29; HB&M​Upper Jacoby Creek (1110.000504)
1-17-033Humboldt​​Sec. 6-8, 17, 18; T4N, R1E; Sec. 13, T4N, R1W; HB&MRyan Slough (1109.300503)​
1-17-041
​Humboldt​Sec. 14, T4N, R1W; HB&M​Ryan Slough (110.000104)
1-17-048Humboldt​​Sec. 20, 21, 28, 29, 32, 33,T6N, R2E; HB&MPowers Creek (1109.100104); Hatchery Creek (1109.200004)​
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)

THP Number

County

Location

CalWater Watershed ID

1-16-095Mendocino​​T18N, R15W, Sec. 4, 5, 7-917; MDBL&M​North Fork of the Noyo River (1113.200105)
1-17-022​Mendocino​T16N, R16W, Sec. 2-4, 10, 11; MD B&M​Middle Albion River (1113.400001); Upper Albion River (1113.400006)
1-17-007​MendocinoT24N, R13W, Sec. 22-27, 35, 36; MD B&M​​Lower Hulls Creek (1111.500103); Hulls Valley (1111.500102); Cold Creek (1111.720202)
1-17-019
Mendocino​​T18N, R17W, Sec. 22; MDB&M​Mouth of Noyo River (1113.200403)
1-17-014Mendocino​​T17N, R15W, Sec. 13, 23-25; T17N, R14W, Sec. 19, 20, 30; MDB&M​Russell Brook (1113.300202); East Branch North Fork Big River (1113.300303)
1-17-020Mendocino​​T21N, R17W, Sec. 28, 32-34; MD BL&M​Chadbourne Gulch (1113.120202); Rider Gulch (1113.130602)​
1-17-038​Mendocino​Sec. 12-14, 24, 25, T19N, R16W; MDBL&M ​Redwood Creek (1113.130301); Upper S. Fork Ten Mile River (1113.130304)
1-17-036​Mendocino​Sec. 21-23, 25-28, T15N, R14W; MDB&M​Middle S. Branch Navarro River (1113.500501); Upper S. Branch Navarro River (1113.500503); North Fork Indian Creek (1113.500401)
1-17-023​MendocinoSec. 6, 29-32, T23N, R17W; MDBL&M​​Middle Hollow Tree Creek (1111.320301); Lower Hollow Tree Creek (1111.320302)
1-17-007​Mendocino​Sec. 22-27, 35, 36, T24N, R13W; MD B&MLower Hulls Creek (1111.500103); Hulls Valley (1111.500102); Cold Creek (1111.720202)​
1-17-042Mendocino​​Sec. 27, 33-35, T15N, R16W; Sec. 2, 3, T14N, R16W; MDB&M​Lower Greenwood Creek (1113.610001)
1-17-004Mendocino​Sec. 10, 15, T18N, R15W; MDBL&M​Olds Creek (1113.200101)
1-17-046 Mendocino​Sec. 33, T14N, R15W; MDB&M​Upper Elk Creek (1113.620002); Lower Rancheria Creek (1113.500203)
1-17-051 Mendocino​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)
1-17-052Mendocino​Sec. 21, T16N, R17W; MDBL&M​Albion River  (1113.400004); Lower Albion River (1113.400003)

THP Number

County

Location

CalWater Watershed ID

1-13-126
NapaSec. 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; MD B&MScotchman Creek (5517.320202); Diamond Creek (5517.340302); Fuller Lake (5517.340303); Upper Steephollow Creek (5516.340202)

THP Number

County

Location

CalWater Watershed ID

2-16-046
Plumas Sec. 3-5, 8-10, 15, 16, T27N, R10E; MD B&M Moonlight Pass (5518.450400); Upper Cooks Creek (5518.530302)

THP Number

County

Location

CalWater Watershed ID

1-17-025San Mateo​​Sec. 34, T7S, R4W; MDB&M​Teawater Creek (2202.400103)

THP Number

County

Location

CalWater Watershed ID

1-17-027
Santa CruzT09S, R02W, Sec. 6; MDBL&M Kings Creek (3304.120101)​
1-98-022Santa Cruz​Rancho Salsipuedes, T10S &11S, R2E; MDB&M​​Browns Creek (3305.100101); Hughes Creek (3305.100302)

THP Number

County

Location

CalWater Watershed ID

2-15-083
Shasta T37N, R04W, Sec. 19, 25, 30, 36; T36N, R05W, Sec. 7, 12, 13; MD B&M North Salt Creek (5525.100209); Boulder Creek (5525.100203); North Fork Shotgun Creek (5525.100103) 
2-13-034​Shasta​Sec. 23, 35, T37N, R1W; Sec. 3, 9, T36N, R1W; MD B&MBush Bar (5526.150301); Stump Creek (5526.160002)​
2-16-091
Shasta​​Sec. 9-11,14-16, 21, 22, T33N, R1E; MD B&M​Silver Lake (5507.320205) 
2-00-006​Shasta​Sec. 22, 23, 26-28, T37N, R3W; MD B&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; MD B&M​Lookout Mountain (5507.330103); Mill Creek (5507.330102)
2-16-077Shasta​​Sec. 14, 21-23, 27, 28, T34N, R1E; MD B&M​Cedar Creek (5507.330201); Upper Montgomery Creek (5526.130003); Lookout Mountain (5507.330103)

THP Number

County

Location

CalWater Watershed ID

2-13-085
SierraSec. 1-3, 5, 7, T18N, R9E; Sec. 13, 23, 25, 30, 33, T19N, R9E; MD B&MSt. Catherine Creek (5517.530301); Gale Creek (5517.410101); Grizzly Gulch (5517.410102); Luck Dog Creek (5517.410103)

THP Number

County

Location

CalWater Watershed ID​

2-17-001​Siskiyou​T44N, R08W, Sec. 3, 4, 9, 10, 15, 16; T44N, Sec. 07W, Sec. 30; MD B&M​​McAdams Creek (1105.420802); Costa Gulch (1105.420603); Soap Creek (1105.420604); East Moffett Creek (1105.420601)

THP Number

County

Location

CalWater Watershed ID

1-17-017​Sonoma​T08N, R09W, Sec. 6; MDB&M
​Felta Creek (1114.240602); Adam and Eve Redwoods (1114.110104)

THP Number

County

Location

CalWater Watershed ID

2-17-007​Trinity​Sec. 2-4, 10, 11, T31N, R10W; Sec. 15, 16, 21-23, 25, 27, 28, 34-36, T32N, R10W; MD B&M​Middleton Gulch (1106.310103); Hazel Gulch (1106.310104); Little Creek (1106.310202); Shock Creek (1106.250410)
2-14-040Trinity​​Sec. 3, 4, 8-10, 15-17, 20-23, 29, T31N, R10E; MD B&MNorth Fork Hayfork Creek (1106.250202); Johnson Creek (1106.310101); Duncan Creek (1106.250403)​

 

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

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

 

​​Other 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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