SAN JOAQUIN COUNTY, CALIFORNIA, AND INCORPORATED AREAS VOLUME 4 OF 4 Community Name Community Number *ESCALON, CITY OF 060644 LATHROP, CITY OF 060738 LODI, CITY OF 060300 MANTECA, CITY OF 060706 RIPON, CITY OF 060457 SAN JOAQUIN COUNTY 060299 (UNINCORPORATED AREAS) STOCKTON, CITY OF 060302 TRACY, CITY OF 060303 * Non Flood-Prone Community OCTOBER 16, 2009 Federal Emergency Management Agency FLOOD INSURANCE STUDY NUMBER 06077CV004A
NOTICE TO FLOOD INSURANCE STUDY USERS Communities participating in the National Flood Insurance Program have established repositories of flood hazard data for floodplain management and flood insurance purposes. This Flood Insurance Study (FIS) may not contain all data available within the repository. It is advisable to contact the community repository for any additional data. Selected Flood Insurance Rate Map panels for the community contain information that was previously shown separately on the corresponding Flood Boundary and Floodway Map panels (e.g., floodways, cross-sections). Former flood hazard zone designations have been changed as follows: Old Zone A1 through A30 B C New Zone AE X X Part or all of this FIS may be revised and republished at any time. In addition, part of this FIS may be revised by the Letter of Map Revision process, which does not involve republication or redistribution of the FIS. It is, therefore, the responsibility of the user to consult with community officials and to check the community repository to obtain the most current FIS components. Initial Countywide FIS Effective Date: October 16, 2009
TABLE OF CONTENTS Volume 1 Page 1.0 INTRODUCTION...1 1.1 Purpose of Study...1 1.2 Authority and Acknowledgments...1 1.3 Coordination...5 2.0 AREA STUDIED...7 2.1 Scope of Study...7 2.2 Community Description...9 2.3 Principal Flood Problems...18 2.4 Flood Protection Measures...25 3.0 ENGINEERING METHODS...35 3.1 Hydrologic Analyses...36 3.2 Hydraulic Analyses...50 3.3 Vertical Datum...70 TABLES Table 1 Initial and Final CCO Dates...7 Table 2a - 2b Flooding Sources Studied by Detailed Methods...7 Table 3 Letter of Map Change...9 Table 4 Tributary Drainage Areas...16 Table 5a - 5b Frequencies of Past Floods...21 Table 6 Dams and Reservoirs of the Mokelumne Basin...25 Table 7a - 7d Storage Projects Affecting Flood Flows in San Joaquin County...27 Table 8 Summary of Elevations...37 Table 9a - 9c Stream Gaging Stations...37 Table 10 Summary of Discharges...45 Table 11 Tide Gaging Stations...52 Table 12 List of Levees Requiring Flood Hazard Revision...71 Table 13a - 13b Vertical Datum Conversions...74 i
TABLE OF CONTENTS (Continued) Volume 2 4.0 FLOODPLAIN MANAGEMENT APPLICATIONS...79 4.1 Floodplain Boundaries...79 4.2 Floodways...80 5.0 INSURANCE APPLICATIONS...118 6.0 FLOOD INSURANCE RATE MAP...119 7.0 OTHER STUDIES...119 8.0 LOCATION OF DATA...123 9.0 BIBLIOGRAPHY AND REFERENCES...124 FIGURES Figure 1 Floodway Schematic...80 TABLES (Continued) Table 14 Floodway Data Tables...82 Table 15 Community Map History...121 ii
TABLE OF CONTENTS (Continued) Volume 3 EXHIBITS Exhibit 1 Flood Profiles Bear Creek Calaveras River Corral Hollow Creek Dry Creek Duck Creek French Camp Slough Grant Line & Fabian & Bell Canal Jahant Slough Lone Tree Creek Middle River Mokelumne River Panels 01P-03P Panels 04P-13P Panels 14P-18P Panels 19P-20P Panels 21P-28P Panels 29P-31P Panels 32P-33P Panels 34P-35P Panels 36P-42P Panels 43P-45P Panels 46P-62P Volume 4 EXHIBITS (Continued) Mormon Channel Panels 63P-65P Mosher Creek Panels 66P-68P North Fork Mokelumne River downstream of SF Mokelumne River Panels 69P-71P North Fork Mokelumne River upstream of SF Mokelumne River Panel 72P North Fork South Littlejohns Creek Panels 73P-75P Old River Panels 76P-79P Paradise Cut Panels 80P-81P San Joaquin River Panels 82P-97P South Fork Mokelumne River Panels 98P 99P South Fork South Littlejohns, South Littlejohns, and Littlejohns Creek Panels 100P-107 Stanislaus River Panels 108P-113P Temple Creek Panels 114P-118P Walker Slough Panel 119P Exhibit 2 Flood Insurance Rate Map Index Flood Insurance Rate Map iii
NOTE: THE 2% ANNUAL CHANCE FLOOD PROFILE IS TOO CLOSE TO THE 1% ANNUAL CHANCE FLOOD ELEVATION TO BE SHOWN SEPARATELY A B C D E LIMIT OF DETAILED STUDY ATCHISON, TOPEKA AND SANTA FE RAILROAD PRIVATE ROAD (LOW WATER CROSSING) GOLDEN GATE AVENUE STATE HIGHWAY 99 F ORO AVENUE 63P MORMON CHANNEL
G H I J WALKER LANE K L 64P MORMON CHANNEL
M N GILLIS ROAD LIMIT OF DETAILED STUDY 65P MORMON CHANNEL
1% ANNUAL CHANCE FLOOD ELEVATION CONTAINED IN CHANNEL NOTE: THE 1% AND 2% ANNUAL CHANCE FLOOD PROFILES ARE COINCIDENT Q R S T U LIMIT OF DETAILED STUDY JACK TONE ROAD V W X 66P MOSHER CREEK
NOTE: THE 1% AND 2% ANNUAL CHANCE FLOOD PROFILES ARE COINCIDENT Y Z AA AB AC AD AE AF AG TULLY ROAD PRIAVTE CROSSING AH AI AJ PRIAVTE CROSSING 67P MOSHER CREEK
NOTE: THE 1% AND 2% ANNUAL CHANCE FLOOD PROFILES ARE COINCIDENT AK AL AM AN AO AP AQ AR AS CLEMENTS ROAD MESSICK ROAD CLEMENTS ROAD LIMIT OF DETAILED STUDY 68P MOSHER CREEK
CONFLUENCE WITH SOUTH FORK MOKELUMNE RIVER NOTE: THE 0.2% AND 2% ANNUAL CHANCE FLOODS DATA AND STREAM BED DATA NOT AVAILABLE NOTE: 10% ANNUAL CHANCE FLOOD PROFILE IS TOO CLOSE TO THE 1% ANNUAL CHANCE ELEVATION TO BE SHOWN SEPARATELY 69P NORTH FORK MOKELUMNE RIVER (DOWNSTREAM OF SOUTH FORK MOKELUMNE RIVER)
NOTE: 10% ANNUAL CHANCE FLOOD PROFILE IS TOO CLOSE TO THE 1% ANNUAL CHANCE ELEVATION TO BE SHOWN SEPARATELY NOTE: THE 0.2% AND 2% ANNUAL CHANCE FLOODS DATA AND STREAM BED DATA NOT AVAILABLE NORTH FORK MOKELUMNE RIVER (DOWNSTREAM OF SOUTH FORK MOKELUMNE RIVER) 70P
NOTE: THE 0.2% AND 2% ANNUAL CHANCE FLOODS DATA AND STREAM BED DATA NOT AVAILABLE WALNUT GROVE ROAD DIVERGENCE FROM SOUTH FORK MOKELUMNE RIVER 71P NORTH FORK MOKELUMNE RIVER (DOWNSTREAM OF SOUTH FORK MOKELUMNE RIVER)
DIVERGENCE FROM SOUTH FORK MOKELUMNE RIVER LIMIT OF DETAILED STUDY NOTE: THE 0.2%, 2% AND 10% ANNUAL CHANCE FLOODS DATA NOT AVAILABLE CONFLUENCE WITH MOKELUMNE RIVER OVERFLOW CHANNEL INTERSTATE 5 LIMIT OF DETAILED STUDY CONFLUENCE WITH COSUMNE RIVER 72P NORTH FORK MOKELUMNE RIVER (UPSTREAM OF SOUTH FORK MOKELUMNE RIVER)
LIMIT OF DETAILED STUDY CONFLUENCE WITH FRENCH CAMP SLOUGH LOW WATER CROSSING CONFLUENCE WITH SOUTH FORK SOUTH LITTLE JOHNS CREEK A B C D E F G H I J K L STATE HIGHWAY 99 NOTE: THE 1% AND 2% ANNUAL CHANCE FLOOD PROFILES ARE COINCIDENT LOW WATER CROSSING PRIVATE ROAD PRIVATE ROAD PRIVATE ROAD IRRIGATION PIPELINES M N O LOW WATER CROSSING P 73P NORTH FORK SOUTH LI TTLEJOHNS CREEK
NOTE: THE 2% ANNUAL CHANCE FLOOD PROFILE IS TOO CLOSE TO THE 1% ANNUAL CHANCE FLOOD ELEVATION TO BE SHOWN SEPARATELY Q R S T U V W X Y Z AA AB AUSTIN ROAD IRRIGATION PIPELINES AC AD AE AF KAISER ROAD 74P NORTH FORK SOUTH LI TTLEJOHNS CREEK
AG AH AI AJ AK AL AM AN AO AP AQ LOW WATER CROSSING JACK TONE ROAD ATCHISON TOPEKA AND SANTA FE RAIROAD LOW WATER CROSSING AR AS AT LIMIT OF DETAILED STUDY IRRIGATION PIPELINES BIFRUCATION OF SOUTH LITTLEJOHNS CREEK INTO SOUTH FORK AND NORTH FORK SOUTH LITTLEJOHNS CREEK 75P NORTH FORK SOUTH LI TTLEJOHNS CREEK
LIMIT OF DETAILED STUDY CONFLUENCE WITH DELTA MENDOTA CANAL NOTE: THE 0.2% AND 2% ANNUAL CHANCE FLOODS DATA AND STREAM BED DATA NOT AVAILABLE 76P OLD RIVER
NOTE: THE 0.2% AND 2% ANNUAL CHANCE FLOODS DATA AND STREAM BED DATA NOT AVAILABLE TRACY BOULEVARD TIDE GAGE 24 77P OLD RIVER
DIVERGENCE OF SUGAR CUT DIVERGENCE FROM PARADISE CUT NOTE: THE 0.2% AND 2% ANNUAL CHANCE FLOODS DATA AND STREAM BED DATA NOT AVAILABLE CONFLUENCE OF MIDDLE RIVER 78P OLD RIVER
NOTE: THE 0.2% AND 2% ANNUAL CHANCE FLOODS DATA AND STREAM BED DATA NOT AVAILABLE CONFLUENCE OF SAN JOAQUIN RIVER LIMIT OF DETAILED STUDY 79P OLD RIVER
CONFLUENCE WITH OLD RIVER LIMIT OF DETAILED STUDY NOTE: THE 0.2% AND 2% ANNUAL CHANCE FLOODS DATA AND STREAM BED DATA NOT AVAILABLE 80P PARADISE CUT
NOTE: THE 0.2% AND 2% ANNUAL CHANCE FLOODS DATA AND STREAM BED DATA NOT AVAILABLE PARADISE DAM WESTERN PACIFIC RAILROAD DIVERGENCE FROM SAN JOAQUIN RIVER LIMIT OF DETAILED STUDY 81P PARADISE CUT
CONFLUENCE OF FOUTEENMILE SLOUGH NOTE: THE STREAM BED DATA NOT AVAILABLE 82P SAN JOAQUIN RIVER
BURNS CUTOFF CONFLUENCE OF CALAVERAS RIVER NOTE: THE STREAM BED DATA NOT AVAILABLE CONFLUENCE OF SMITH CANAL 83P SAN JOAQUIN RIVER
CONFLUENCE OF STOCKTON DEEPWATER CHANNEL A B C D E F G H ATCHISON TOPEKA AND SANTA FE RAILWAY NAVY DRIVE BURNS CUTOFF AT UPSTREAM I J K ATCHISON TOPEKA AND SANTA FE RAILWAY L 84P SAN JOAQUIN RIVER
M N O P Q R S T U STATE HIGHWAY 4 CONFLUENCE WITH FRENCH CAMP SLOUGH V W X Y 85P SAN JOAQUIN RIVER
Z AA AB AC AD AE AF AG AH AI AJ AK AL AM 86P SAN JOAQUIN RIVER
AN AO AP AQ AR AS AT AU AV AW BOWMAN ROAD (BRANDT BRIDGE) AX AY AZ 87P SAN JOAQUIN RIVER
BA BB BC BD BE BF BG BH BI BJ BK BL BM BN 88P SAN JOAQUIN RIVER
BO BP BQ BR BS BT BU BV BW BX DIVERGENCE OF OLD RIVER BY BZ CA CB 89P SAN JOAQUIN RIVER
CC CD CE CF CG CH CI CJ CK CL CM SOUTHERN PACIFIC RAILROAD MANTHEY ROAD CN CO CP STATE HIGHWAY 120 INTERSTATE HIGHWAY 5 STATE HIGHWAY 120 90P SAN JOAQUIN RIVER
CQ CR CS CT CU CV CW CX CY UNION PACIFIC RAILROAD CZ DA DB DC CONFLUENCE OF PARADISE CUT 91P SAN JOAQUIN RIVER
DD DE DF DG DH DI DJ DK DL DM DN DO DP 92P SAN JOAQUIN RIVER
DQ DR DS DT DU DV BANTA CARBONA LIFT CANAL DW 93P SAN JOAQUIN RIVER
DX DY DZ 94P SAN JOAQUIN RIVER
EA EB EC ED EE EF EG EH 95P SAN JOAQUIN RIVER
EI EJ EK EL EM AIRPORT WAY EN 96P SAN JOAQUIN RIVER
EO EP EQ ER ES CONFLUENCE OF STANISLAUS RIVER LIMIT OF DETAILED STUDY 97P SAN JOAQUIN RIVER
NOTE: THE 0.2% AND 2% ANNUAL CHANCE FLOODS DATA NOT AVAILABLE CONFLUENCE WITH HOG SLOUGH CONFLUENCE WITH BEAVER SLOUGH 98P SOUTH FORK MOKELUMNE RIVER
NOTE: THE 0.2% AND 2% ANNUAL CHANCE FLOODS DATA NOT AVAILABLE WALNUT GROVE ROAD DIVERGENCE FROM NORTH FORK MOKELUMNE RIVER 99P SOUTH FORK MOKELUMNE RIVER
CONFLUENCE WITH FRENCH CMP SLOUGH AND NORTH FORK SOUTH LITTLEJOHNS CREEK LOW WATER CROSSING LIMIT OF DETAILED STUDY A B C D E F G H I J K IRRIGATION PIPELINE PRIVATE ROAD PRIVATE ROAD LOW WATER CROSSING CONFLUENCE OF LONE TREE CREEK PRIVATE ROAD STATE HIGHWAY 90 PRIVATE ROAD NOTE: THE 2% AND 0.2% ANNUAL CHANCE FLOOD PROFILES ARE TOO CLOSE TO THE 1% ANNUAL CHANCE FLOOD ELEVATION TO BE SHOWN SEPARATELY L M N O PRIVATE ROAD LOW WATER CROSSING 100P SOUTH FORK SOUTH LITTLEJOHNS CREEK, SOUTH LITTLEJOHNS CREEK AND LITTLEJOHNS CREEK
NOTE: THE 2% AND 0.2% ANNUAL CHANCE FLOOD PROFILES ARE TOO CLOSE TO THE 1% ANNUAL CHANCE FLOOD ELEVATION TO BE SHOWN SEPARATELY P Q R S T U V W X Y Z AA AB LOW WATER CROSSING AUSTIN ROAD AC AD AE AF IRRIGATION PIPELINE KAISER ROAD AG 101P SOUTH FORK SOUTH LITTLEJOHNS CREEK, SOUTH LITTLEJOHNS CREEK AND LITTLEJOHNS CREEK
AH AI AJ AK AL AM AN AO AP AQ AR AS JACK TONE ROAD BURLINGTON NORTHERN SANTA FE RAILROAD LOW WATER CROSSING AT AU AV AW AX BIFURCATION OF SOUTH LITTLEJOHNS CREEK INTO NORTH FORK SOUTH LITTLEJOHNS CREEK AND SOUTH FORK SOUTH LITTLEJOHNS CREEK LOW WATER CROSSING DIVERSION STRUCTURE IRRIGATION PIPELINE DIVERSION STRUCTURE 102P SOUTH FORK SOUTH LITTLEJOHNS CREEK, SOUTH LITTLEJOHNS CREEK AND LITTLEJOHNS CREEK
AY AZ BA BB BC BD BE BF BG BH BI MARIPOSA ROAD IRRIGATION PIPELINE BJ BK BL LOW WATER CROSSING LOW WATER CROSSING IRRIGATION PIPELINE 103P SOUTH FORK SOUTH LITTLEJOHNS CREEK, SOUTH LITTLEJOHNS CREEK AND LITTLEJOHNS CREEK
BM BN BO BP BQ BR BS BT BU BV BW BX BY BZ CA 104P SOUTH FORK SOUTH LITTLEJOHNS CREEK, SOUTH LITTLEJOHNS CREEK AND LITTLEJOHNS CREEK
VAN ALLEN ROAD BIFURCATION OF SOUTH LITTLEJOHNS CREEK INTO NORTH FORK SOUTH LITTLEJOHNS CREEK AND SOUTH FORK SOUTH LITTLEJOHNS CREEK IRRIGATION PIPELINE STANLEY ROAD SOUTH FORK SOUTH LITTLEJOHNS CREEK, SOUTH LITTLEJOHNS CREEK AND LITTLEJOHNS CREEK CB CC CD CE CF CG CH CI CJ CK CL CM CN CO CP 105P
CQ CR CS CT LOW WATER CROSSING CU CV CW CX CY LOW WATER CROSSING 106P SOUTH FORK SOUTH LITTLEJOHNS CREEK, SOUTH LITTLEJOHNS CREEK AND LITTLEJOHNS CREEK
CZ DA DB DC DD LOW WATER CROSSING ESCALON-BELLOTA ROAD SOUTHERN PACIFIC RAILROAD DUCK CREEK DIVERSION CHANNEL LIMIT OF DETAILED STUDY 107P SOUTH FORK SOUTH LITTLEJOHNS CREEK, SOUTH LITTLEJOHNS CREEK AND LITTLEJOHNS CREEK
NOTE: THE 2% AND 10% ANNUAL CHANCE FLOODS DATA NOT AVAILABLE A B C D E F G LIMIT OF DETAILED STUDY H I 108P STANISLAUS RIVER
J K L M N O P Q R S RAILROAD STATE NOTE: THE 2% AND 10% ANNUAL CHANCE FLOODS DATA NOT AVAILABLE HIGHWAY 99 T U V 109P STANISLAUS RIVER
NOTE: THE 2% AND 10% ANNUAL CHANCE FLOODS DATA NOT AVAILABLE STANISLAUS RIVER W X Y Z AA AB AC AD 110P
NOTE: THE 2% AND 10% ANNUAL CHANCE FLOODS DATA NOT AVAILABLE AE AF AG AH AI AJ AK RAILROAD AL AM AN MC HENRY AVENUE 111P STANISLAUS RIVER
AO AP AQ AR AS AT AU AV AX AY AZ PIPELINE RAILROAD SANTA FE ROAD NOTE: THE 2% AND 10% ANNUAL CHANCE FLOODS DATA NOT AVAILABLE WITHOUT LEFT LEVEE BA BB 112P STANISLAUS RIVER
NOTE: THE 2% AND 10% ANNUAL CHANCE FLOODS DATA NOT AVAILABLE BC BD 113P STANISLAUS RIVER
2% ANNUAL CHANCE FLOOD PROFILE 0.2% AND 2% ANNUAL CHANCE FLOOD TOO CLOSE TO THE 1% ANNUAL CHANCE ELEVATION TO BE SHOWN SEPARATELY PROFILES TOO CLOSE TO THE 1% ANNUAL CHANCE ELEVATION TO BE SHOWN SEPARATELY JACK TONE ROAD PRIVATE DRIVE WILDWOOD ROAD TEMPLE CREEK A B C D E F G H I J 114P
0.2% AND 2% ANNUAL CHANCE 2% ANNUAL CHANCE FLOOD PROFILE TOO CLOSE FLOOD PROFILES TOO CLOSE TO THE 1% ANNUAL CHANCE ELEVATION TO BE SHOWN SEPARATELY TO THE 1% ANNUAL CHANCE ELEVATION TO BE SHOWN SEPARATELY ATCHISON TOPEKA AND SANTA FE RAILROAD IRRIGATION PIPELINE MURPHY ROAD NOTE: THE 2% AND 0.2% ANNUAL CHANCE FLOOD PROFILES ARE TOO CLOSE TO THE 1% ANNUAL CHANCE FLOOD ELEVATION TO BE SHOWN SEPARATELY WAGNER ROAD TEMPLE CREEK K L M N O P Q R S T U V 115P
PRIVATE DRIVE MARIPOSA ROAD NOTE: THE 2% AND 0.2% ANNUAL CHANCE FLOOD PROFILES ARE TOO CLOSE TO THE 1% ANNUAL CHANCE FLOOD ELEVATION TO BE SHOWN SEPARATELY PRIVATE ROAD TEMPLE CREEK W X Y Z AA AB AC AD AE AF AG AH 116P
VAN ALLEN ROAD NOTE: THE 2% AND 0.2% ANNUAL CHANCE FLOOD PROFILES ARE TOO CLOSE TO THE 1% ANNUAL CHANCE FLOOD ELEVATION TO BE SHOWN SEPARATELY DIVERSION STRUCTURE TEMPLE CREEK ROAD PRIVATE DRIVE NOTE: THE 2% AND 0.2% ANNUAL CHANCE FLOOD PROFILES ARE TOO CLOSE TO THE 1% ANNUAL CHANCE FLOOD ELEVATION TO BE SHOWN SEPARATELY TEMPLE CREEK AI AJ AK AL AM AN AO AP AQ AR AS AT AU 117P
NOTE: THE 2% AND 0.2% ANNUAL CHANCE FLOOD PROFILES ARE TOO CLOSE TO THE 1% ANNUAL CHANCE FLOOD ELEVATION TO BE SHOWN SEPARATELY AV AW AX AY AZ BA BB PRIVATE DRIVE PRIVATE DRIVE ESCALON BELLOTA ROAD LIMIT OF DETAILED STUDY 118P TEMPLE CREEK
CONFLUENCE WITH FRENCH CAMP SLOUGH LIMIT OF DETAILED STUDY A B C D E F G H INTERSTATE HIGHWAY 5 MANTHEY ROAD INTERSTATE HIGHWAY 5 S TURNPIKE ROAD TIDEWATER SOUTHERN RAILROAD UNION PACIFIC RAILROAD UNION PACIFIC RAILROAD CONFLUENCE OF DUCK CREEK SOUTHERN PACIFIC RAILROAD O'DELL AVENUE EL DORADO STREET SOUTHERN PACIFIC RAILROAD YARD LIMIT OF DETAILED STUDY 1% ANNUAL CHANCE BACKWATER FROM FRENCH CAMP SLOUGH 119P WALKER SLOUGH