Building · 2026
MT01006I St Johns
Helena, MT · near Helena Rgnl (3.0 mi)
What this outcome means
The FAA studied the proposal and concluded it would not be a hazard to air navigation. A no-hazard determination is not permanent — it carries an expiration date, and if the structure is not built by then the case has to be re-filed.
The proposal, in the filer's words
"We are requesting a reconsideration of the Marking / Lighting requirement in keeping with the original determination for this location that did not require it (ASN 2011-ANM-1493-OE is the original study for this location). As requested for the refiling the coordinates and structure height for the corner of the building were provided as were the coordinates and overall height of the highest appurtenance (antenna)."
Filing details
- Case number (ASN)
- 2026-ANM-3589-OE
- Structure
- MT01006I St Johns
- Type
- Building
- Category
- Building
- Height above ground
- 70 ft
- Height above sea level
- 4,269 ft
- Site elevation
- 4,199 ft
- Notice of
- Existing
- Duration
- Permanent
- Marking & lighting
- —
Timeline
- Filed
- May 14, 2026
- Determined
- August 3, 2026
- Determination expires
- —
Who filed it
- Sponsor
- T-mobile WEST LLC
- Representative
- Dynamic Environmental Associates, INC. - 1
Names are shown as they appear in the FAA's public record. How we handle names
Location
- Coordinates
- 46.584806, -112.036667
- Degrees / minutes / seconds
- 46°35'05.3"N 112°02'12.0"W
- County
- Lewis and Clark
- Open in a map
- Google MapsOpenStreetMap
Other filings within 5 miles
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About this record
This page is a readable copy of a public record published by the FAA's Obstruction Evaluation / Airport Airspace Analysis system. It is not the official record and may lag it. For the authoritative case status, search this ASN at the FAA's OE/AAA portal. If something here is wrong, email support@idea-engine.studio and we will correct it.
Source: FAA Obstruction Evaluation / Airport Airspace Analysis (OE/AAA) public archive (oeaaa.faa.gov), data as of September 12, 2026. Compiled by LOS Analyzer (Idea Engine LLC). This is not an official FAA record or an FAA determination; the FAA's portal is authoritative. LOS Analyzer is not affiliated with or endorsed by the FAA.
Screening a structure of your own?
Check Part 77 and the tower's line of sight before you file
LOS Analyzer screens a proposed structure against FAA Part 77 surfaces and the control tower's sightline to the runway, terrain-aware, in minutes. It is a preliminary screening — not an FAA determination and not a substitute for a licensed engineering review.