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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. These 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.

THP Number

County

Location

CalWater Watershed ID

2-15-047Butte T24N, R03E, Sec. 2, 3, 9-11, 15, 16; T25N, R03E, Sec. 1, 11, 12, 14, 15, 22, 23, 26, 27, 34, 35; MD B&MCarpenter Ridge (5521.300202); Timbered Crater (5521.300201); Bull Creek (5521.300205) 

THP Number

County

Location

CalWater Watershed ID

 4-15-008Calaveras T06N, R14E, Sec. 8, 17; MDBL&M Lower Licking Fork (6532.600701); Schaads Reservoir (6532.600804) 

THP Number

County

Location

CalWater Watershed ID

1-15-038Del Norte T15N, R01E, Sec. 28, 32, 33; HB&M(1103.500001)
1-15-045 Del Norte T14N, R01E, Sec. 2, 3, 10, 11, 15; HB&M Upper West Fork Hunter Creek (1105.110802); Lower West Fork Hunter Creek (1105.110803) 
 1-15-048 Del NorteT18N, R01W, Sec. 11, 12; T18N, R01E, Sec. 7, 18; HB&M Lower Rowdy Creek (1103.120001); S. Fork Winchuck River (1101.000001); Dominie Creek (1103.110004) 
1-15-069 Del Norte  T19N, R01W, Sec. 33, 34; T18N, R01W, Sec. 3; HB&MSouth Fork Winchuck River (1101.000001)

THP Number

County

Location

CalWater Watershed ID

4-15-004El Dorado T12N, R10E, Sec. 3, MDBL&M Canyon Creek (1109.200005) 

THP Number

County

Location

CalWater Watershed ID

 1-15-030Humboldt  T01N, R03W, Sec. 34-36; T01N, R02W, Sec. 31; T01S, R03W, Sec. 1; T01S, R02W, Sec. 6; HB&M(1112.200203) 
 1-15-024Humboldt T04S, R04E, Sec. 1, 12, 13; T04S, R05E, Sec. 7; HB&M Upper Jewett Creek (1111.420604); Steelhead Creek (1111.410303) 
 1-14-153Humboldt  T01N, R01W, Sec. 16, 17; HB&MHowe Creek (1111.110101) 
 1-15-039Humboldt T12N, R02E, Sec. 8, 9, 16, 17; HB&M Terup Creek (1105.110703); Ah Pah Creek (1105.110702) 
 1-15-043Humboldt T05N, R02E, Sec. 6; T06N, R02E, Sec. 31; T05N, R01E, Sec. 1; HB&M  (1109.100104) 
1-15-044 Humboldt T05N, R02E, Sec. 2, 3, 10-13; T05N, R03E, Sec. 6, 8; HB&M Upper Cannon Creek (1109.300603); Lower Cannon Creek (1109.300602); Dry Creek (1109.300601) 
 1-15-046Humboldt T03N, R01W, Sec. 2, 3, 10, 11; HB&M Middle Salmon Creek (1110.000060) 
 1-15-025 HumboldtT01S, R02W, Sec. 22, 25-27; HB&M Peaked Creek (1112.200102); South Fork Bear River (1112.200205); West Side Creek (1112.200201) 
 1-15-050 HumboldtT10N, R02E, Sec. 22, 23, 26, 27; HB&M Metah Creek (1105.110305); Upper Roach Creek (1105.110306); Roach Creek (1105.110301) 
 1-15-037 HumboldtT01N, R03E, Sec. 35; T01S, R03E, Sec.  1-3, 11 Lower Larrabee Creek (1111.130300); Burr Creek (1111.130201)
1-15-054  HumboldtT05N, R01E, Sec.3  Lower Jacoby Creek (1110.005003)
 1-15-053 Humboldt T08N, R01W, Sec. 1, 12; T08N, R01E, Sec.6, 7, 9, 10, 15-17, 22; HB&MMaple Creek (1108.100003) 
1-15-061 Humboldt T10N, R01E, Sec.5; HB&M  McDonald Creek (1108.100002); Skunk Cabbage Creek (1107.100203)
1-15-059 Humboldt T07N, R03E, Sec. 10, 14, 15, 22, 23; HB&M  Minor Creek (1107.200001); Upper Lacks Creek (1107.200202); Toss-Up Creek (1107.200302)
1-15-057 Humboldt  T11N, R02E, Sec. 27-29, 32, 33; HB&MUpper Tectah Creek (1105.110405); Lower Tectah Creek (1105.110401) 
 1-15-063Humboldt T03N, R01W, Sec. 27, 28; HB&M  Palmer Creek (1111.110202)
 1-15-068Humboldt T01N, R02E, Sec. 20; T02N, R02E, Sec. 25, 26, 34-36; HB&M Stevens Creek (1111.220603); Grizzly Creek (1111.220602) 
 1-15-075 HumboldtT03N, R01W, Sec. 27; HB&M Palmer Creek (1111.110202)
 1-15-034Humboldt T02S, R04E, Sec. 34, 35; T03S, R04E, Sec. 2, 3, 10, 11;HB&M Basin Creek (1111.410401); Willow Creek (1111.410402) 
 1-99-037Humboldt T01N, R02W, Sec. 21, 28, 29; HB&M  Johnson Gulch (1112.200202); S. Fork Bear River (1112.200201)

THP Number

County

Location

CalWater Watershed ID

2-15-032LassenT28N, R11E, Sec. 7-10, 15, 16, 21; MD B&MWest Branch Lights Creek (5518.530201); Upper Willard Creek (8637.200301)

THP Number

County

Location

CalWater Watershed ID

 1-15-012Mendocino T16N, R13W, Sec. 31; T16N, R14W, Sec. 36; T15N, R13W, Sec. 6, 7; T15N, R14W, Sec. 1, 12 Upper Ackerman Creek (1114.310301) 
1-14-156 MendocinoT16N, R15W, Sec. 20, 28, 29; MDBL&M John Smith Creek (1113.500601); Dutch Henry Creek (1113.500602); Albion River (1113.400006) 
 1-13-118Mendocino  T23N, R17W, Sec. 3: MDBL&MLower Hollow Tree Creek (1111.320302); Mill Creek (1111.320401) 
 1-15-031Mendocino T16N, R15W, Sec. 3, 4, 9, 10; MDBL&M  Mettick Creek (1113.300103); Upper Albion River (1113.400006)
 1-07-013Mendocino  T12N, 12W, Sec. 22-24, 26, 27, 35, 36; MDBL&MSoda Creek (1114.240102) 
 1-15-029 MendocinoT17N, R15W, Sec. 12, 13, 24; T17N, R14W, Sec. 18; MDBL&M East Branch North Fork Big River (1113.300303) 
 1-15-040 Mendocino T12N, R13W, Sec. 3-5; MDBL&MMaple Creek (1113.500103); Middle Rancheria Creek (1113.500106); Pardaloe Creek (1113.700105) 
 1-15-036Mendocino  T16N, R16W, Sec. 27-29, 33, 34; MDBL&MBig Salmon Creek (1113.400005) 
1-15-058 Mendocino T14N, R16W, Sec. 4, 5, 8, 9; MDBL&M Lower Elk Creek (1113.620001) 
 1-15-056Mendocino T23N, R17W, Sec. 8, 17, 20, 21; MDBL&M  Lower Hollow Tree Creek (1111.320302)
1-11-114 MendocinoT17N, R16W, Sec. 15-17, 20-22; MDBL&M Berry Gulch (1113.300402); Mouth of Big River (1113.300403); Two Log Creek (1113.300406) 
 1-15-062 MendocinoT17N, R15W, Sec. 20, 21, 27-29; MDBL&M East Branch North Fork Big River (1113.300304); Lower North 
Fork Big River (1113.399496) 
 1-15-070 MendocinoT19N, R16W, Sec. 20-23; 26, 28, 29; MDBL&M Churchman Creek (1113.130302) 
 1-15-074Mendocino T13N, R16W, Sec. 28; MDBLM Lower Brush Creek (1113.640001) 
1-15-066 Mendocino  T19N, R16W, Sec. 3-5; T20S, R16W, Sec. 31, 32; MDBL&MBear Haven Creek (1113.130203); Lower Middle Fork Ten Mile River (1113.130202) 
1-15-071Mendocino​T14N, R16W, Sec. 28, 29; MDBL&M​Mallo Pass Creek (1113.630002)​

THP Number

County

Location

CalWater Watershed ID

2-15-007Nevada T15N, R09E, Sec. 2; T16N, R09E, Sec. 35; MD B&M Missouri Canyon (5516.340301) 
 2-14-107 NevadaT18N and T19N, R11E and R12E, Sec. 1-3, 12, 6, 7, 31, 36; MDB&M  Poorman Creek (5517.320102); Bear Creek (5517.420102); East Fork Creek (5517.420101)

THP Number

County

Location

CalWater Watershed ID

2-15-002Placer T15N, R11E, 14, 15, 22, 23; MD B&M Huges Mill (5514.520002); Pagge Creek (5514.520004); Humbug Canyon (5514.550301) 

THP Number

County

Location

CalWater Watershed ID

 2-14-070Plumas T26N, R09E, Sec. 25; T26N, R10E, Sec. 30; MD B&M Hough Creek (5518.530403) 
2-15-018Plumas T24N, R09E, Sec. 15, 16, 21, 22; T24N, R10E, Sec. 20, 29; MD B&M Lower Knox Flat (5518.520204); East Clairmont (5518.520201); Thompson Creek 5518.520305) 
 2-15-032 PlumasT28N, R11E, Sec. 7-10, 15, 16, 21; MD B&MWest Branch Lights Creek (5518.530201); Upper Willard Creek (8637.200301) 

THP Number

County

Location

CalWater Watershed ID

 2-15-008 ShastaT32N, R02E, Sec. 12, 13; T32N, R03E, Sec. 7, 17, 18; MD BL&M Upper Battle Creek (5507.120104); Beal (5507.310103) 
2-15-002Shasta T38N, R01E, Sec. 27, 28, 34; MD B&M Devils Canyon (5526.160001); Curtis (5526.160003) 
2-15-034  ShastaT34N, R05W, Sec. 29-32; MD B&M Upper Squaw Creek (5506.200402); Lower Squaw Creek (5506.200401); Lower Backbone Creek (5506.200405) 
 2-15-001Shasta T31N, R03E, Sec. 36; T29N, R04E, Sec. 17; T31N, R01E, Sec. 9; T31N, R01W, Sec. 36; T35N, R08W, Sec. 18; MDBL&MBlue Lake Canyon (5507.120204); Nanny Creek (5507.120503); North Fork Bear Creek (5507.220103); Shingle Creek (5507.220101); Mule Creek (1106.400908) 
 2-15-035 Shasta T39N, R02W, Sec. 25, 26, 36; T39N, R01W, Sec. 30, 31; MDBL&MAngel Creek (5505.240702) 

THP Number

County

Location

CalWater Watershed ID

2-15-039Siskiyou T39N, R01W, Sec. 19, 20, 29, 30; MD B&M Angel Creek (5505.240702) 
2-15-035 Siskiyou T39N, R02W, Sec. 25, 26, 36; T39N, R01W, Sec. 30, 31; MDBL&M  Angel Creek (5505.240702)
 2-15-044Siskiyou  T42N, R01W, Sec. 23, 25, 27, 29;MD B&M Horse Peak (5505.240103); Dry Creek (5505.240101); Swamp Creek (5505.240400)
  2-15-042 SiskiyouT42N, R01W, Sec. 9, 11, 15, 21, 23; MDBL&M  Antelope Creek (1105.830100)

THP Number

County

Location

CalWater Watershed ID

1-11-005SonomaT10N, R13W, Sec. 8, 16, 17; MDBL&M Flat Ridge Creek (1113.840302)
 1-15-001Sonoma T07N, R10W, Sec. 32; MDBL&M Fay Creek (1115.100002) 
 1-15-033 SonomaT10N, R14W, Sec. 8, 16, 17, 21, 22; MDBL&M Mouth of Gualala River (1113.850202) 
 1-15-042Sonoma T11N, R15W, Sec. 25, 26, 36; T11N, R14W, Sec. 30, 31, 33; T10N, R14W, Sec. 4-6, 8, 15-17, 21, 22, 27; T11N and T10N, R14W and R15N, Portions of German Rancho   Big Pepperwood Creek (1113.850201); Mouth of Gualala (1113.850202); Little Creek (1113.830004); Annapolis (1113.840303)

THP Number

County

Location

CalWater Watershed ID

 2-15-017Siskiyou  T44N, R08W, Sec. 1, 5, 7, 8; MD BL&MMcAdam Creek (1105.420802); Lower Indian Creek (1105.420803) 

THP Number

County

Location

CalWater Watershed ID

2-15-001TehamaT31N, R03E, Sec. 36; T29N, R04E, Sec. 17; T31N, R01E, Sec. 9; T31N, R01W, Sec. 36; T35N, R08W, Sec. 18; MDBL&MBlue Lake Canyon (5507.120204); Nanny Creek (5507.120503); North Fork Bear Creek (5507.220103); Shingle Creek (5507.220101); Mule Creek (1106.400908) 

THP Number

County

Location

CalWater Watershed ID

2-15-025 Trinity  T39N, R06W and R07W, Sec. 19, 24, 25; MD B&MRamshorn Creek (1106.400202); Sherer Creek (1106.400102) 
 2-15-022 TrinityT35N, R08W, Sec. 15, 23, 27; MD B&M Strope Creek (1106.400807); Bear Gulch (1106.400806) 
 2-15-001Trinity T31N, R03E, Sec. 36; T29N, R04E, Sec. 17; T31N, R01E, Sec. 9; T31N, R01W, Sec. 36; T35N, R08W, Sec. 18; MDBL&M  Blue Lake Canyon (5507.120204); Nanny Creek (5507.120503); North Fork Bear Creek (5507.220103); Shingle Creek (5507.220101); Mule Creek (1106.400908) 
 2-15-021Trinity T35N, R09W, Sec. 15, 21, 27; MDB&M Stoney Creek (1106.400907); Trinity Alps Creek (1106.400906) 

THP Number

County

Location

CalWater Watershed ID

4-15-006Tuolumne T04N, R15E, Sec. 13; T04N, R16E, Sec. 1, 2, 7-12, 15-18; 04N, R17E, Sec. 7, 16, 17; MDB&MDry Meadow Creek (1105.420604); Soap Creek (6534.410601)

THP Number

County

Location

CalWater Watershed ID

2-14-111Yuba T20N, R08E, Sec. 11-14, 23-26; T20N, R09E, Sec. 5, 8, 9, 16, 17, 19, 20; MD B&M Gold Run (5517.520202); Cherokee Creek (5517.530404); Brushy Creek (5517.520201); Union Hill (5517.530403)

 

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.