Engineering Standards

(This file is 4.4MB and may take a while to download)

The Engineering Standards are design standards for new infrastructure that is proposed to be part of the City of Helena’s over all infrastructure systems.  There are design standards for streets, water, sewer, and storm water.  The intention of these standards is to combine current ordinances, city policy, state permit, state requirements, and best engineering practices to achieve predictability for the review process, maintain compliance with permits and consistency of the systems.

HELENA COORDINATE SYSTEM

Basis of Horizontal

GEODETIC NORTH OBTAINED BY GPS OBSERVATIONS & OPUS PROCESSING.

DATUM: NAD83 (2011) (EPOCH 2010.00)

PROJECTION: TRANSVERSE MERCATOR

CENTRAL MERIDIAN: W 111°57'00” (-111.95°)

PROJECT ORIGIN LATITUDE: N 46°30'00” (46.5°)

SCALE FACTOR AT CENTRAL MERIDIAN: 1.000191

FALSE NORTHING: 100,000.000 IFT (30,480m)

FALSE EASTING: 200,000.000 IFT (60,960m)

Basis of Vertical

NAVD88 US SURVEY FEET AS OBTAINED THROUGH OPUS PROCESSING AND GEOID 12A.


 

CAD STANDARDS

Templates

Filename Info Modified
Basemap_-_Existing__-_C3D.dwt 1,002 KB 22.01.2018 15:19
Basemap_-_Proposed_-_C3D.dwt 843 KB 22.01.2018 15:19
COVER_SHEET.dwt 1 MB 22.01.2018 15:19
DETAIL_SHEET.dwt 632 KB 22.01.2018 15:19
GENERAL_SHEET.dwt 892 KB 22.01.2018 15:19
PLAN_PROFILE_SHEET.dwt 1,000 KB 22.01.2018 15:19
PLAN_SHEET.dwt 993 KB 22.01.2018 15:19
PLANSTACKED_SHEET.dwt 999 KB 22.01.2018 15:19

Plot Style

Filename Info Modified
GWE.stb 744 B 22.01.2018 15:20

Linetype

Filename Info Modified
acad.lin 19 KB 22.01.2018 15:20
acad.mln 2 KB 22.01.2018 15:20
ltypeshp.shx 130 B 22.01.2018 15:20

Blocks

Filename Info Modified
STANDARD_BLOCKS.dwg 2 MB 22.01.2018 15:20

CAD Standards

Filename Info Modified
20180117-CAD_Standard.pdf 54 KB 22.01.2018 15:20