The official California Highway Patrol website is www.chp.ca.gov
CHP Computer Aided Dispatch - This is the CHP's web site where you can locate near real time information on working incidents.
CHP Abbreviations - What's an 11-85? Now you can find out by looking up codes and abbreviations commonly used by the CHP.

CHP Radio Frequencies
Channel Base Mobile
Tac-1 44.86 44.86
Tac-2 45.94 45.94
Tac-3 44.94 44.94
Tac-4 45.02 45.02
Tac-5 45.06 45.06
Tac-6 39.92 39.92
Border Tac 39.92 42.64
Amber 42.08 42.82
Amber-2 42.08 42.76
Aqua 42.62 42.84
Beige-1 39.88 42.08
Black 42.46 42.70
Blue 42.34 42.18
Blue-1 39.14 42.18
Bronze 42.12 42.40
Brown 42.50 42.82
Copper 42.60 42.74
Copper-1 39.26 42.74
Emerald 42.88 42.20
Gold 42.12 42.20
Gold-1 39.60 42.20
Grape 42.42 42.66
Gray 42.48 42.68
Gray-1 39.72 42.68
Green 42.54 42.24
Green-1 39.36 42.24
Ivory 45.02 45.02
Maroon 42.92 42.74
Maroon-1 42.92 42.64
Orange 42.88 42.66
Orange-1 39.40 42.66
Pink 42.44 42.76
Purple 42.40 42.16
Purple-1 39.44 42.16
Red 42.44 42.28
Ruby 42.50 42.28
Silver 42.08 42.28
Tan 42.42 42.84
Tan-1 39.80 42.84
Teal 42.36 42.78
Turquoise 42.60 42.02
Turquoise-1 39.68 42.02
Violet 42.16 42.64
White 42.56 42.72
Yellow 42.52 42.30

CHP PL Tones
Division PL Tone
1 Northern 107.2
2 Valley 179.9
3 Golden Gate 131.8
4 Central 146.2
5 Southern 192.8
6 Border 162.2
7 Coastal 167.9
8 Inland 118.8

CHP Extender and Misc Frequencies
Description Frequency Tone
1 Car to Station 154.9050 173.8
2 Car to Car 154.9050 186.2
154.9050 156.7
3 No PL Direct 154.9050
4 CLEMARS 154.9200
5 CALCORD 156.0750
6 NLEMARS 155.4750
NOTES:1. Plumas County uses 155.4450 in place of 154.9050

2. Susanville Dispatch (ROSE) has been know to use 153.9350 for their extender when having interference problems with 155.4450

Mutual Aid Channels
Description Frequency
GOLD-1 CLEMARS 154.9200
GOLD 2 CLEMARS 154.9350
GOLD-3 NLEMARS 155.4750
GOLD-6 CLEMARS 39.4600
GOLD-7 CLEMARS 45.8600
GOLD 12 CLEMARS 39.1000

Aircraft
Description Frequency
BLUE 42.3400
IVORY 45.0200
VHF (Primary) 122.8500
VHF (Secondary) 122.8750
Helicopter Air to Air 123.0250
Fixed Wing Air to Air 122.7500

State Building Security, VIP Protection & Law Enforcement Liaison
Description Frequency
Ch 1 Operations 1 460.3750
Ch 2 Operations 2 460.4500
Ch 3 Operations 3 453.8350
Ch 4 Operations 4 453.8500
Ch 5 Tactical 1 460.0875
Ch 6 Tactical 2 460.2125
Ch 7 Tactical 3 460.3375

Special Units
5000 Governor
5001 Lt. Governor
5049 Governor's Driver
5050 Lt. Governor's Driver
5100-98  Office of Emergency Services
5200-98 American Red Cross
5400-98 U.S. Military Services
5555 Emergency Command Post
5600-98 Department of Justice
5700-98 Department of Justice
5826 National Auto Theft Bureau
5836-7 LASO prisoner transportation 
5838-9 SDSO prisoner transportation 
5841 SDSO "RACES ONE"
5851-60 California Youth Authority
5871 Riverside SO command post
5872 San Bernardino SO command post
5873 Orange SO command post
8800-98 Central services
CHP-1 CHP Commissioner
CHP-2 CHP Deputy Commissioner

CHP and Trunked Radio
I've received many questions regarding the CHP's plans to move to a trunked radio system and when this might happen. I hope this will help clear things up. For the past several years (posted 5/2001), the State of California has been studying the potential of a statewide trunked radio system that would serve the State's ten largest public-safety agencies, and perhaps be available for participation by local similar local agencies. The ten Departments and agencies that participated in the study are: 
California Highway Patrol
Corrections
Fish and Game
Forestry and Fire Protection
Justice
Parks and Recreation
Transportation
Water Resources
Youth Authority
Office of Emergency Services
The system would be based on a hybrid combination of VHF-HB channels and 800 MHz channels (the State considers that the 800 MHz band includes the entire range from 741 MHz to 869 MHz). 800 MHz has significantly less propagation range than VHF-HB, and would be used in the metropolitan and more-developed areas, where a relatively dense network of base stations is necessary and practical. VHF-HB would be used in the rural areas, where its superior range is valuable, and where the terrain and sparser population would make 800 MHz costly and impractical. The entire UHF land-mobile band, i.e., from 406MHz (including military frequencies) through 869MHz, is under consideration for the hybrid system. Trunking would be used for the areas covered by UHF channels. In the VHF-HB areas, some may be trunked, and the most remote areas would use conventional channels. The system would be based on digital transmission. A plan has been approved for a four-year pilot project that will provide a joint trunked radio system to serve several counties in the Sacramento area. Further, the Division of Telecommunications is continuing to study current and evaluate technologies other than Project 25, specifically TETRA and the MA/COM digital radio product, now being planned for a statewide system in Pennsylvania.

Click on the map to jump to the frequencies for that area
Mobiles repeated on base frequency.

101 Northern Division - Redding

HUMBOLDT DISPATCH CENTER
Location Office Units Channel Base Mobile Tone  
Crescent City 120 95 Green 42.54 42.24 107.2
Humboldt 125 16 Green 42.54 42.24 107.2
Garberville 126 105 Green 42.54 42.24 107.2

REDDING DISPATCH CENTER
Location Office Units Channel Base Mobile Tone  
Red Bluff 130 36 Red 42.44 42.28 107.2  
Cottonwood Inspection Facility 131   Red 42.44 42.28 107.2  
Redding 135 37 Red 42.44 42.28 107.2  
Trinity River 175 90 Red 42.44 42.28 107.2  

SUSAN VILLE DISPATCH CENTER
Location Office Units Channel Base Mobile Tone  
Susanville 140 38 Amber-2 42.08 42.76 107.2  
Quincy 165 20 Amber-2 42.08 42.76 107.2  
Alturas 170 60 Amber-2 42.08 42.76 107.2  

YREKA DISPATCH CENTER
Location Office Units Channel Base Mobile Tone  
Yreka 145 41 Purple 42.40 42.16 107.2  
Mt. Shasta 146 52 Purple 42.40 42.16 107.2  
Dunsmuir Grade Insp. Facility 147 84 Purple 42.40 42.16 107.2  

UKIAH DISPATCH CENTER
Location Office Units Channel Base Mobile Tone  
Ukiah 150 18 White 42.56 42.72 107.2  
Clear Lake 151 7 White 42.56 42.72 107.2  
Williams* 155 39 White 42.56 42.72 107.2
Willows* 160 93 White 42.56 42.72 107.2
* Williams and Willows are dispatched by Chico

201 Valley Division - Sacramento

SACRAMENTO DISPATCH CENTER
Location Office Units Channel Base Mobile Tone  
Sacramento Comm Center 214 107          
Auburn 220 45 Green 42.54 42.24 179.9  
Grass Valley 230 42 Green 42.54 42.24 179.9  
Placerville 245 44 Green 42.54 42.24 179.9  
North Sacramento 250 46 Gold 42.12 42.20 179.9  
South Sacramento 252 112 Black 42.46 42.70 179.9
Woodland 280 47 Black 42.46 42.70 179.9

TRUCKEE DISPATCH CENTER
Location Office Units Channel Base Mobile Tone  
Gold Run 221 70 Gray 42.48 42.68 179.9  
Truckee 222 80 Gray 42.48 42.68 179.9  
Donner Pass Inspection Facility 223 109 Gray 42.48 42.68 179.9  
South Lake Tahoe 246 13 Gray 42.48 42.68 179.9  

CHICO DISPATCH CENTER
Location Office Units Channel Base Mobile Tone  
Oroville 240 35 Brown 42.50 42.82 179.9
Chico 241 104 Brown 42.50 42.82 179.9
Yuba-Sutter 285 43 Brown 42.50 42.82 179.9

STOCKTON DISPATCH CENTER
Location Office Units Channel Base Mobile Tone  
San Andreas 255 49 White 42.56 42.72 179.9  
Stockton 265 62 White 42.56 42.72 179.9  
Tracy 266 103 White 42.56 42.72 179.9  
Amador 295 94 White 42.56 42.72 179.9  

301 Golden Gate Division - Vallejo

GOLDEN GATE COMMUNICATIONS CENTER
Location Office Units Channel Base Mobile Tone  
Golden Gate Comm Center 318 119          
Contra Costa 320 19 Maroon 42.92 42.74 131.8  
Napa 325 21 Grape 42.42 42.66 131.8  
Redwood City 330 91 Amber 42.08 42.82 131.8
San Francisco 335 32 Pink 42.44 42.76 131.8
San Jose 340 24 Ruby 42.50 42.28 131.8
West San Jose 340 119 Ruby 42.50 42.28 131.8
Hayward 345 25 Aqua 42.62 42.84 131.8
Nimitz Inspection Facility 347 126 Aqua 42.62 42.84 131.8  
Marin 350 34 Violet 42.16 42.64 131.8
Santa Rosa 360 17 Emerald 42.88 42.20 131.8  
Solano 365 22 Turquoise 42.60 42.02 131.8  
Cordelia Inspection Facility 366 127 Turquoise 42.60 42.02 131.8  
Oakland 370 96 Bronze 42.12 42.40 131.8
Dublin 390 118 Aqua 42.62 42.84 131.8  
Mission Grade Inspection Facility 391   Aqua 42.62 42.84 131.8  

401 Central Division - Fresno

BAKERSFIELD DISPATCH CENTER
Location Office Units Channel Base Mobile Tone  
Bakersfield 420 69 Brown 42.50 42.82 146.2  
Grapevine Inspection Facility 424 129 Turquoise 42.60 42.02 146.2
Buttonwillow 426 117 Turquoise 42.60 42.02 146.2
Fort Tejon 430 102 Turquoise 42.60 42.02 146.2

FRESNO DISPATCH CENTER
Location Office Units Channel Base Mobile Tone  
Fresno 435 65 Silver 42.08 42.28 146.2  
Hanford 440 68 Pink 42.44 42.76 146.2  
Visalia 480 67 Pink 42.44 42.76 146.2  
Porterville 481 40 Pink 42.44 42.76 146.2  
Coalinga 495 88 Pink 42.44 42.76 146.2  

MERCED DISPATCH CENTER
Location Office Units Channel Base Mobile Tone  
Sonora 425 61 Yellow 42.52 42.30 146.2  
Madera 450 66 Orange 42.88 42.66 146.2  
Mariposa 455 63 Orange 42.88 42.66 146.2  
Oakhurst 456 63 Orange 42.88 42.66 146.2  
Merced 460 64 Orange 42.88 42.66 146.2  
Los Banos 461 30 Orange 42.88 42.66 146.2  
Modesto 465 48 Yellow 42.52 42.30 146.2  
Chowchilla River Insp. Facility 464 140 Orange 42.88 42.66 146.2

501 Southern Division - Los Angeles

LOS ANGELES COMMUNICATIONS CENTER
Location Office Units Channel Base Mobile Tone  
Los Angeles Comm Center 514 5          
Baldwin Park 525 81 Orange 42.88 42.66 192.8  
South Los Angeles 530 77 White 42.56 42.72 192.8  
East Los Angeles 535 82 Yellow 42.52 42.30 192.8  
Newhall 540 78 Tan 42.42 42.84 192.8  
Castaic Inspection Facility 541 130 Tan 42.42 42.84 192.8  
Antelope Valley 545 89 Tan 42.42 42.84 192.8  
Santa Fe Springs 550 83 Gold 42.12 42.20 192.8  
West Los Angeles 565 79 Pink 42.44 42.76 192.8  
Altadena 575 98 Brown 42.50 42.82 192.8  
West Valley 580 56 Teal 42.36 42.78 192.8  
Central Los Angeles 590 15 Black 42.46 42.70 192.8  
Central Los Angeles (secondary) 590 15 Peach-1 39.34 42.26 192.8  

Los Angeles / Orange County Detail Map
Click map for larger image

601 Border Division - San Diego

EL CENTRO DISPATCH CENTER
Location Office Units Channel Base Mobile Tone  
Winterhaven 620 116 Maroon-1 42.92 42.64 162.2
El Centro 625 85 Maroon-1 42.92 42.64 162.2
Calexico Inspection Facility 626 141 Maroon-1 42.92 42.64 162.2

BORDER COMMUNICATIONS CENTER
Location Office Units Channel Base Mobile Tone  
Border Communications Center 618            
San Diego 645 87 Orange-1 39.40 42.66 162.2
Otay Mesa Inspection Facility 646 142 Orange-1 39.40 42.66 162.2
Oceanside 650 92 Tan-1 39.80 42.84 162.2
San Onofre Inspection Facility 651 132 Tan-1 39.80 42.84 162.2
El Cajon* 680 108 Gold-1 39.60 42.20 162.2
Temecula 685 115 Tan-1 39.80 42.84 162.2
Rainbow Inspection Facility 686 134 Tan-1 39.80 42.84 162.2
Border Air Operations 122            
*El Cajon is on the Regional Communications System. See the San Diego County page for more information.

INDIO DISPATCH CENTER
Location Office Units Channel Base Mobile Tone  
Indio 630 76 Red 42.44 42.28 162.2
San Gorgonio Pass 655 97 Red 42.44 42.28 162.2
Desert Hills Inspection Facility 656 131 Red 42.44 42.28 162.2
Blythe 660 6 Red 42.44 42.28 162.2

ORANGE COUNTY COMMUNICATIONS CENTER
Location Office Units Channel Base Mobile Tone  
Orange Communications Center 676 138
Santa Ana 675 86 Purple-1 39.44 42.16 162.2
Capistrano 690 113 Green-1 39.36 42.24 162.2
Westminster 670 55 Gray-1 39.72 42.68 162.2

701 Costal Division - San Luis Obispo

MONTEREY DISPATCH CENTER
Location Office Units Channel Base Mobile Tone  
Santa Cruz 720 26 Green 42.54 42.24 167.9
Hollister-Gilroy 725 23 Green 42.54 42.24 167.9
Gilroy Inspection Facility 726 135 Green 42.54 42.24 167.9
Monterey 730 27 Black 42.46 42.70 167.9
King City 735 8 Black 42.46 42.70 167.9

SAN LUIS OBISPO DISPATCH CENTER
Location Office Units Channel Base Mobile Tone  
Templeton 740 9 White 42.56 42.72 167.9
San Luis Obispo 745 28 White 42.56 42.72 167.9
Santa Maria 750 14 White 42.56 42.72 167.9
Buellton 755 3 White 42.56 42.72 167.9

VENTURA DISPATCH CENTER
Location Office Units Channel Base Mobile Tone  
Santa Barbara 760 29 Green 42.54 42.24 167.9  
Ventura 765 31 Purple 42.40 42.16 167.9
Conejo Inspection Facility 766 137 Purple 42.40 42.16 167.9

801 Inland Division - San Bernardino

INLAND COMMUNICATIONS CENTER
Location Office Units Channel Base Mobile Tone  
Inland Communications Center 818 125          
Riverside 840 74 Turquise-1 39.68 42.02 118.8
Rancho Cucamonga 855 123 Beige-1 39.88 42.08 118.8
San Bernardino 860 75 Copper-1 39.26 42.74 118.8
Arrowhead 865 101 Copper-1 39.26 42.74 118.8

BISHOP DISPATCH CENTER
Location Office Units Channel Base Mobile Tone  
Bridgeport 820 71 Gold 42.12 42.20 118.8
Bishop 825 72 Gold 42.12 42.20 118.8
Mojave 830 59 Gold 42.12 42.20 118.8

BARSTOW DISPATCH CENTER
Location Office Units Channel Base Mobile Tone  
Needles 834 114 White 42.56 42.72 118.8
Barstow 835 73 White 42.56 42.72 118.8  
Victorville 850 12 White 42.56 42.72 118.8
Morongo Basin 870 106 White 42.56 42.72 118.8

Special thanks to Ed Greany for contributing the CHP/CALTRANs map.
Special thanks to Mike for contributing information and corrections.
Special thanks to the folks of the ScanNorCal Yahoo Group for contributing information.
Special thanks to the folks of the SoCalScan Yahoo Group for contributing information.
Special thanks to the State of California and the California Highway Patrol.