Memo Transmission Towers f� C I T Y O F H O P R I N S
M E M O R A N D U M
DATE: March 27, 1991
TO: City Council
FROM: Nancy Anderson
SUBJECT: Transmission Towers
This is the second reading for the ordinance which will
regulate transmission towers and antennas in Hopkins.
Attached is a letter from US West regarding the minimum
height they would need for a transmission tower. Also
attached is several other cities ordinances regarding the
height of the towers.
I have also changed the ordinance to allow antennas on top
-1 of buildings in industrial district.
The minimum height for a building in an industrial district
is 45 feet. Staff would recommend a height greater than 45
feet for a transmission tower.
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CITY OF HOPKINS
Hennepin County, Minnesota
ORDINANCE NO. 91-672
AN ORDINANCE AMENDING HOPKINS ZONING ORDINANCE SECTION 560
PERTAINING TO ANTENNAS
BE IT ORDAINED, by the City Council of the City of Hopkins
as follows:
That the Hopkins Zoning Ordinance No. 515 be and the same is
hereby amended by adding the following provisions:
Section 515 - Zoning Code• definitions
Subd. 8. Antenna: a system of wires, poles, rods,
reflecting discs, or similar devices used for the transmission or
reception of electromagnetic waves, which system is external to
or attached to the exterior of any structure.
Subd. 115. Transmission Tower - commercial: a structure
situated on a nonresidential site that is intended for
transmitting or receiving television, radio, or telephone
communications, excluding those used exclusively for public
'� safety communications. An AM radio tower is its own transmitting
antenna.
Subd. 116. Transmission tower - heiaht: The height of a
transmission tower shall be the total maximum to which it is
capable of being raised and shall be measured from the highest
point of the finished grade adjacent to the structure if ground-
mounted or roof-mounted.
All subsections following these subsections are hereby
renumbered.
That the Hopkins Zoning Ordinance No. 540 is hereby amended
as follows:
540. 03 Conditional uses: I districts. The following uses are
permitted conditional uses in I districts:
b) Transmission Tower - commercial subject to Section
560. 02
That the Hopkins Zoning Ordinance No. 560 is hereby amended
as follows:
560. 01. Additional requirements Subdivision 1. Height.
Height limitations as set forth in all zoning districts may be
^ increased by 50% when applied to the following:
a) antennas in residential districts
b) belfries
.�
c) church spire and steeples
d) cooling towers
e) elevator penthouse
f) flag poles
g) smoke stacks
h) water towers
Subd. 2 . Excess. Heights in excess thereof for such
purposes may be permitted only by a conditional use permit.
560. 02 . Transmission Tower - Commercial. Commercial
transmission towers shall be permitted with a conditional use
permit in the industrial districts subject to the following
conditions:
a) commercial transmission towers shall be in
compliance with all city building and electrical code
requirements;
b) verification that the structural design has been
^ approved by a professional engineer;
c) verification that the mounting system and
installation have been approved by a professional engineer;
d) submission of written authorization from the
property owner;
e) no advertising message shall be on the tower
structure;
f) shall comply with setback requirements for
principal structures and in no event shall be located
between the principal structure and the front lot line;
g) transmission towers that are not self-supporting
shall be supported by objects within the property lines but
not in any front-yard areas;
h) the base of tranmission towers, including guy
wires, supporting and accessory structures shall be screened
to the greatest extent practicable to minimize visual
impacts on surrounding properties. Screening shall include
landscape materials or architectural features that harmonize
with the elements and characteristics of the property for
ground mounted towers and materials compatible with those
^ utilized on the exterior of the building for roof mounted
antennas;
i) towers located closer to a property line than the
height of the tower shall be designed and engineered to
collapse progressively within the distance between the tower
�
and the property line except if there is a use that the City
Council indicates will not be affected by a tower collapse;
(i.e. railroad right-of-way, lake, creek, unbuildable land)
j ) towers shall be in compliance with all applicable
federal communications commission (FCC) requirements;
k) towers shall be in compliance with all applicable
federal aviation administration (FAA) requirements;
1) towers shall require security fencing of 10 feet in
height around the base;
m) towers shall not be artificially lighted unless
required by the FAA or state aeronautics division;
n) at least two off-street parking spaces and one
additional space for each two on-site personnel will be
provided;
o) all transmission towers shall be built to
structurally accommodate the maximum number of foreseeable
uses technically practicable;
p) no conditional use permit will be granted for a
^ transmission tower until the existing transmission tower is
fully utilized.
q) that one commercial transmission tower is allowed
per site.
r) that the maximum height of a commercial
transmission tower is 75 feet.
560. 03 . Antennas. Antennas used for a commercial use may be
attached to existing structures in residential and business
districts providing no antenna is 20 feet taller than the
existing structure. Only two antennas maybe allowed on an
existing structure.
First Reading: February 5, 1991
Second Reading: April 2 , 1991
Date of Publication: April 10, 1991
Date Ordinance is Effective: April 30, 1991
�
Nelson W. Berg, Mayor
ATTEST:
James A. Genellie, City Clerk
�
MINNETONKA
RECEIVE-ONLY SATELLITE DISH ANTENNAS AND OTHER ANTENNA
DEVICES.
a) receive-only satellite dish antennas and other antenna
devices subject to the following requirements:
1) shall be in compliance with all city building and
electrical code requirements;
2) verification that the structural design has been
approved by a professional engineer;
3) verification that the mounting system and installation
have been approved by a professional engineer;
4) one per building or, if more than one antenna is
proposed, the antennas shall be clustered in a single,
screened location;
5) submission of written authorization from the property
owner;
6) no advertising message shall be on the antenna
-� structure;
7) shall comply with setback requirements for principal
structures and in no event shall be located between the
principal structure and the front lot line;
8) shall be screened to the greatest extent practicable to
minimize visual impacts on surrounding properties.
Screening shall include landscape materials for ground
mounted antennas and materials compatible with those
utilized on the exterior of the building for roof
mounted antennas;
9) antennas located closer to a property line than the
height of the antenna shall be designed and engineered
to collapse progressively within the distance between
the antenna and the property line;
10) shall be in compliance with all applicable federal
communications commission (FCC) requirements; and
11) antenna height shall be no more than 60' as measured
from the ground upon which it is located.
Plymouth 10-36
"� Height limitations set forth elsewhere in the Ordinance may
be increased by conditional use permit when applied to the
following:
."�
1) Church spires, belfries, or domes which do not contain
usable space.
2) Water Towers.
3) Chimneys or smokestacks, radio and television towers. �
Maple Grove page 28
Subd 3 . Height. The building height limits established
herein for districts shall not apply to the following:
a. Belfries
b. Chimneys or flues
c. Church spires
d. Cooling towers
e. Cupolas and domes which do not contain useable space
f. Elevator penthouses
g. Flag poles
h. Monuments
i. Parapet walls extending not more than three (3) feet the
limiting height of the building.
j . Water towers
k. Poles, towers and other structures for essential
^ services
1. Necessary mechanical and electrical appurtenances
m. Television and radio antennas not exceeding twenty (20)
feet above roof.
n. Farm Buildings
Wayzata 5. 1
Building Height: Chimneys, cooling towers, elevator
bulkheads, fire towers, monuments, penthouses, water towers,
stacks, stage towers, scenery lofts, tanks, ornamental
towers and spires, wireless towers, television antennas , CB
antennas or necessary mechanical appurtenances shall not be
erected to a height exceeding forty (40) feet.
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