Tank stack · 2026
Mariposa Bioenergy Facility - Stack
Mariposa, CA · near Mariposa-Yosemite (1.5 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
"Project is installing a 60' high stack for a bioenergy plant in Mariposa. The height of the stack is below the height of the currently surrounding forest trees on the adjacent hillside. Surveyor concluded that the stack height is 78' below the 1:20 slope from the Mariposa Yosemite Airport. Please see attached certified survey."
Filing details
- Case number (ASN)
- 2026-AWP-839-OE
- Structure
- Mariposa Bioenergy Facility - Stack
- Type
- Power_plant
- Category
- Tank stack
- Height above ground
- 60 ft
- Height above sea level
- 2,455 ft
- Site elevation
- 2,395 ft
- Notice of
- New Construction
- Duration
- Permanent
- Marking & lighting
- —
Timeline
- Filed
- January 15, 2026
- Determined
- February 25, 2026
- Determination expires
- August 25, 2027
A determination that lapses before the structure is built has to be re-filed. The FAA does not send a reminder.
Who filed it
- Sponsor
- West Biofuels
- Representative
- West Biofuels, LLC
Names are shown as they appear in the FAA's public record. How we handle names
Location
- Coordinates
- 37.505087, -120.013190
- Degrees / minutes / seconds
- 37°30'18.3"N 120°00'47.5"W
- County
- Mariposa
- Open in a map
- Google MapsOpenStreetMap
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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
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