MountainWest Pipeline

Maintenance Construction Schedule - MountainWest Pipeline

2026 Schedule

Period	Category	Preliminary Dates	Duration	Location	Project	Possible Customer Impact	Current Capacity (Dth/d)	Restricted Capacity (Dth/d)	Anticipated Firm Cut Quantity	Anticipated Total Nomination Cut %
March	Compressor Maintenance	March 3 - 5	3 Days	Fidlar Compressor Station	Station ESD Testing	All Compression Offline. Increased pressures at (MAP 370) Red Wash	(MAP 370) Red Wash - Fidlar: 330,000 Dth/d	N/A	0 Dth/d	0%
March	Compressor Maintenance	March 4	1 Day	Skull Creek Compressor Station	Station ESD Testing	All Compression Offline	(MAP 167) Skull Creek Delivery: 44,000 Dth/d (MAP 967) Skull Creek Reciept: 45,850 Dth/d	(MAP 167) Skull Creek Delivery: 44,000 Dth/d (MAP 967) Skull Creek Receipt: 0 Dth/d	ALL	100%
March - April	Reservoir Testing	March 28 - April 9	13 Days	Clay Basin	Annual Withdawal Test	No physical injections allowed starting GD March 28 through GD March 30. GD March 31, constant 250 MMcf/day WD rate. GD April 1, constant 275 MMcf/day WD rate. GD April 2 through GD April 8, reservoir shut-in Resume normal operations GD April 9.	Varies, See latest EBB	Mar 31 Withdraw: 262,500 Dth/d Apr 1 Withdraw: 288,750 Dth/d Apr 2- Apr 8: 0 Dth/d	ALL	100%
April	Compressor Maintenance	April 20 - 24	5 days	Oak Springs Compressor Station	Station ESD Testing	Capacity reduction on ML 104 Goshen Segment of 120,000 Dth/d	ML 104 Goshen: 384,500 Dth/d	ML 104 Goshen: 264,500 Dth/d	TBD	TBD
April	Compressor Maintenance	April 27- May 1	5 Days	Simon Compressor Station	Station ESD Testing	Capacity reduction on ML22 to Nightingale Segment of 27,650 Dth/d. Increased ML22 pressures for Vermillion Plant MAP 293, Skull Creek Delivery MAP 167, Skull Creek Receipt MAP 967	Nightingale ML22 Segment: 206,650 Dth/d	Nightingale ML 22: 179,000 Dth/d	0 Dth/d	0%
May	Anomaly Digs	May 3 - 9	7 Days	JL46/JL47	Anomaly digs	Reduced Flows on JL46 Myton and JL47 Myton Segments	JL 46 Myton: 66,200 Dth/d JL 47 Myton: 77,700 Dth/d	TBD	TBD	TBD
May	Compressor Maintenance	May 12 - 13	2 Days	Kanda Compressor Station	Station ESD Testing	All Compression Offline Kanda/Col CIG DEL MAP 171 shut in Kanda/Col CIG REC MAP 871 shut in	Kanda/Col CIG DEL MAP 171: 178,000 Dth/d Kanda/Col CIG REC MAP 871:138,000 Dth/d	Kanda/Col CIG DEL MAP 171: 0 Dth/d Kanda/Col CIG REC MAP 871:0 Dth/d	ALL	100%
May	Compressor Maintenance	May 18 - 22	5 Days	Leroy Compressor Station	Station ESD Testing	No Injection or Withdraw at Leroy	Aquifer Storage Injection: 61,200 Dth/d Aquifer Storage Withdraw: 134,900 Dth/d	Aquifer Storage Injection 31,200 Dth/d Aquifer Storage Withdraw: 74,900 Dth/d	0 Dth/d	0%
June	Compressor Maintenance	June 15 - 19	5 Days	Thistle Creek Compressor Station	Station ESD Testing	All Compression Offline Lowered capacity on ML 104 Goshen Segment	ML 104 Goshen Segment: 384,500 Dth/d	ML 104 Goshen: 302,000 Dth/d	TBD	TBD
July	Compressor Maintenance	July 7 - 8	2 Days	Coleman Compressor Station	Station ESD Testing	All Compression Offline	Kanda/Coleman Segment: 410,000 Dth/d	TBD	TBD	TBD
October	Reservoir Testing	October 4 - 17	13 Days	Clay Basin	Annual Injection Test	No physical withdraw allowed starting GD Oct 4 through GD Oct 6. GD Oct 6, constant 250 MMcf/day INJ rate. GD oct 7, constant 275 MMcf/day INJ rate. GD October 8 through GD October 15, reservoir shut-in Resume normal operations GD October 16.	Varies, See latest EBB	TBD	ALL	100%

Note: This schedule is subject to change. It is recommended the Shippers monitor MountainWest Pipeline's critical notices about schedule revisions.