USA Banner

Official US Government Icon

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure Site Icon

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Portions of this site may be affected due to a lapse in appropriations and associated shutdown/furloughs. Please monitor this page for updates on site availability and operating status.

Riverview East Stack Extension

PERMITTING DASHBOARD PROJECT POSTING DATE: JULY 22, 2025

All dates below are specific to the schedule of the Environmental Review and Permitting processes for this project.

In Progress

ENVIRONMENTAL REVIEW AND PERMITTING STATUS
IN PROGRESS

icon_calendar

ESTIMATED COMPLETION DATE OF ENVIRONMENTAL REVIEW AND PERMITTING
03/02/2027

0 out of 5

ENVIRONMENTAL REVIEW AND PERMITTING PROCESSES
COMPLETED

Manufacturing

SECTOR
Manufacturing

Project Category

CATEGORY
Project Category FAST-41 Covered Projects

Department of the Army

LEAD AGENCY
Department of the Army, US Army Corps of Engineers - Regulatory

View FAST-41 Postings by Agencies

Description:

Mosaic Fertilizer, LLC (Mosaic) owns and operates the Riverview Fertilizer Manufacturing Plant in Hillsborough County, Florida where phosphate ore is processed to manufacture sulfuric acid, phosphoric acid, fluorosilicic acid, and ammoniated phosphate fertilizer products. Manufacturing produces phosphogypsum, a solid waste material that must be stored in an engineered feature known as phophogypsum stack, or “gypstack”. The manufacturing facility has two phosphogypsum storage stacks (the now closed West Stack and the currently operating East Stack). The purpose of the Riverview East Stack Extension project is to extend the East Stack to provide the storage capacity needed to maintain current production levels until the end of life of the manufacturing plant.

Permitting Timetable

The permitting timetable below displays data as reported by agencies. Dates for Environmental Review and Permitting processes (Actions) that are in 'Paused' or 'Planned' status are subject to change and are not indicative of a project's final schedule.

  • For information about extensions, select an Action from the timetable below and select 'View Action Details' at the bottom of the page.
Overall Project Timetable
 
STATUS
Schedule
Extension or Delay
Ahead of Schedule
Paused
No End Date
Planned

Action Information

For additional information, please select an Action from the Permitting Timetable above.

  • Action:  
  • Responsible Agency:  
  • Bureau:  
  • Action Status:  
  • SHPO:  
  • Action Identifier:  
  • Action Outcome:  
Milestone Original Target Date Current Target Date Milestone Complete
View Action Details