2. Street Lighting - Silverbrook EstatesCity of Kalispell Public Works Department
Post Office Box 1997, Kalispell, Montana 59903-1997 -Telephone (406)758-7720, Fax (406)758-7831
REPORT TO: Mayor and City Council
FROM: James C. Hans2, P.E., Director of Publ
SUBJECT: work. Session — Silverbrook Estates
MEETING DATE: July 16, 2007
At a recent work session, the developer and engineer, CTA, for Silverbrook Estates requested a
deviation from the City's current street lighting standards. Council directed that a specific
proposal be developed and CTA has done this. Their proposal is attached.
There are significant deviations from City standards, and these are noted in the Public works
Department response, also attached. CTA will be present at the work session to outline their
proposal and to address the deviations from City standards. They have also been encouraged to
outline how the concerns of City Council, specifically that pedestrians are not forced to walk on
public sidewalks in the dark will be addressed.
July 16, 2007 work session Silverbrook Street Lighting.doc
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City of Kalispell Publi*c Works Department
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Post Office Box 1997, Kalispell., Montana 59903- 1997 Telephone 406758-772U, Fax 406755-783 I
July 12, 2007
Wayne Freeman,
Di recto r-CTA La ndworks
10180 Cottonwood Road
Bozeman Montana 59718
Via email
RE: Street Lighting Revisions — Silverbrook Estates
Your Letter Dated July 6,, 2007
Dear Mr. Freeman:
We have examined the referenced submittal and found the proposed lighting does not
meet the City Lighting Standards except for Silverbrook Drive. The lighting layout for
the remainder of the residential streets within the development deviates from the City
lighting standards as follows:
1. The minimum average illumination of 0.3 foot-candles at the outer edge of the
sidewalks has not been achieved (industry wide design guides recommend a
minimum of 0.2 foot -candies of illumination for sidewalks). The proposed lighting
provides 1 foot candle directly under the lurninaire and 0.25 at the outermost edge
of the illuminated area.
2. The benchmark uniformity ratio has not been achieved.
I The lights are not spaced to a consistent interval. The majority of the residential
sidewalks receive no illumination at all. There are many areas along the sidewalks
that have gaps up to 300 feet where there will be no measurable illumination.
We understand that CTA will bring this issue before the City Council during a work
session Monday, July 16, for discussion. We would recommend that you should be
prepared to discuss the following:
1. How your design deviates from the City standard.
2. The lighting level provided and how it deviates from the City Standard and how your
design addresses the dark spots where there is no measurable illumination.
3. The design fails to ensure pedestrians are not walking in the dark. The solution for
the dark areas does not lie in relying upon people's porch lights.
For sidewalk lighting you may want to consider bollards placed on the sidewalk side of
the street with shielding to prevent the light from impacting the street side.
If you have any questions, please do not hesitate to contact this office,
Sincerely,
Frank Castles, P.E.
Deputy Public Works Director/Assistant City Engineer
Cc: Jim Patrick, City Manager
Jim Hansz, Public Works Director/City Engineer
Tom Jentz, City Planner
Deb Rasa, CTA
Howard Mann
93 and Church, LLC
3154 Parkwood Lane
Bigfork, Montana 59911
July 6, 2007
City of Kalispell
Public Works Department
Attn: Frank Castles, P.E.
306 1 st Avenue East
P.O. Box 1007
Kalispell, MT 59903
Re: Street Lighting Revisions - Silverbrook Estates
Dear Mr. Castles:
Recently, we have been having discussions with you about the street lighting at
Silverbrook Estates. Our desire is to create a lighting network that meets safety
concerns but does not provide excessive lighting throughout the development
On Monday .June 13, 2007, CTA presented a proposal on our desired lighting pattern to
the City Council in a workshop format. Our preferred lighting pattern utilized a
decorative fixture and spaced the lights at a minimum 700' apart with lighting at every
intersection. Silverbrook Drive, which is the main Boulevard through the subdivision
would meet the city's lighting standard.
The result of the meeting is that the City Council instructed CTA to forward a proposal
through the Public Works Department for formal Council review and if appropriate,
approval..
Attached you will find our proposed lighting patterns. We have made modifications to
our original concept. This lighting plan places lights in average distances of 200 to 300
feet apart. There are two locations where lights are 500 feet apart. Lights occur at
every intersection and Silverbrook Drive follows the City Standard. Light standards
have been raised to 24 feet but we retain the ability to meet the City's Dark Sky
Initiative. It is important to note that:
■ CTA has raised the fixture height to 24'9
■ Increased the amount of light fixtures significantly from the previous plan,
Decreased the spacing of the fixtures,
■ selected different fixtures than previously presented widening the lighting pattern,
■ There will be a significant amount of light emitted by porch lights, driveway and
yard lights in between the street light fixtures.
We believe this lighting pattern best represents all interested parties needs. We would
like to get this proposal to the City Council for their review as soon as possible. Please
let me know if I can do anything else to expedite this process.
Best Regards,
Wayne Freeman,
Director-CTA LandWorks
CC: Torn Mentz, City of Kalispell
James Patrick, City of Kalispell
Howard Mann, 93 and Church, LLC
Deb Rosa, CTA
r SI LVERBROOK ESTATES
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