The complete 2013 subdivision regulations can be accessed here.  Individual chapters and appendices can be downloaded below:

The current subdivision regulations (effective December 13, 2016) can be accessed here.

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TITLE PAGE (pdf)
TABLE OF CONTENTS(pdf)
CHAPTER I.     GENERAL PROVISIONS…I-I (pdf)
CHAPTER II.   ADMINISTRATIVE PROVISIONS…II-I  (pdf)
CHAPTER III.    PROCEDURES FOR MAJOR SUBDIVISIONS…III-I (pdf)
CHAPTER IV.  PROCEDURES FOR MINOR SUBDIVISIONS…IV-I (pdf)
CHAPTER V.    CORRECTING OR AMENDING FILED FINAL PLATS…V-I (pdf)
CHAPTER VI.   PROCEDURES FOR SUBDIVISIONS CREATED BY RENT OR LEASE…VI-I (pdf)
CHAPTER VII.  GENERAL STANDARDS FOR MOBILE HOME PARKS…VII (pdf)
CHAPTER VIII.  GENERAL STANDARDS FOR RECREATIONAL VEHICLE PARKS…VIII-I (pdf)
CHAPTER IX.    PLANNED UNIT AND CLUSTER DEVELOPMENTS…IX-I (pdf)
CHAPTER X.    CONDOMINIUMS AND TOWNHOUSES…X-I  (pdf)
CHAPTERXI. GENERAL DESIGN AND IMPROVEMENT STANDARDS…XI-I(pdf)

APPENDICES
A.  Definitions (pdf)
B.  Subdivision Application Form, Contents, and Supplements (pdf)
C.  Part 1: Information Required for Environmental Assessment Under the Subdivision and Platting Act (C-1) (pdf)
     Part 2: Information Required for a Summary of Probable Impacts (C-2) (pdf)
    Part 3: Subdivision Checklist (c-3) (pdf)
D.  Standards for Final Subdivision Plats (pdf)
E.  Subdivision Improvement Guarantees (pdf)
F.  Standards and Requirements for Flood Hazard Evaluation (pdf)
G.  Lewis and Clark County Road Naming, Road Sign Identification, and Installation Conventions (pdf)
H.  Lewis and Clark County Addressing Conventions (pdf)
I.   Criteria for Review of Claimed Exemptions From Provisions of the Subdivision and Platting Act (pdf)
J.   Lewis and Clark County Road Standards  (pdf)
K.   Fire Protection Standards (pdf)
L.   Water Body Classifications (pdf)