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 %
May	Pig	May 20-21	2 Day	ML 13 Nightingale to Eakin	Smart Tool	ML22 Segment @55,000 Dth/d	ML22 Segment: @206,650 Dth/d	TBD	TBD	TBD
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	Anomaly Digs	May 18 - 28	10 Days	ML48/ML60 Junction to Hyrum Gate	Anomaly Digs	Lower Operating Pressures	N/A	N/A	0 Dth/d	0%
June	Pig	June 2-4	3 Days	ML 104 Thistle to Goshen	Smart Tool	None	ML 104 Goshen Segment: 384,500 Dth/d	N/A	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
June	Pig	June 16 - 20	4 Days	ML 2 Coalville to Little Mountain	Smart Tool	None	N/A	N/A	0 Dth/d	0%
June	Pig	June 24-25	2 Days	ML 14 Coalville to Little Mountain	Smart Tool	None	N/A	N/A	0 Dth/d	0%
July	Anomaly Digs	July 6- 31	28	ML 1, ML13, and ML15 from Nightingale to Eakin	Anomaly Digs	Taps switching lines. No impacts anticipated. No flow reduction or pressure restrictions.	N/A	N/A	0 Dth/d	0%
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
July	Pig	July 15-16	2 Days	ML 104 Thistle to Goshen	Smart Tool	None	ML 104 Goshen Segment: 384,500 Dth/d	N/A	0 Dth/d	0%
August	Pig	August 4	1 Day	ML 1 Nightingale to Eakin	Smart Tool	MAP 293 @50,000 Dth/d	MAP 293: 172,500 Dth/d	MAP 293: 50,000 Dth/d	TBD	TBD
August	Anomaly Digs	Aug 3- 15	13 Days	ML22 and ML23 Skull Creek Compressor	Anomaly Digs	Capacity reduction on ML22 Nightengale segment, reduced pressures.	Varies, See latest EBB	TBD	TBD	TBD
August	Anomaly Digs	August 3-15	13 Days	ML 15 Eakin to Coleville	Anomaly Digs	None	N/A	N/A	0 Dth/d	0%
August	Pig	August 4-7	3 Days	ML 1 Nightingale to Eakin	Smart Tool	MAP 293 @50,000 Dth/d	MAP 293: 172,500 Dth/d	MAP 293: 50,000 Dth/d	TBD	TBD
August	Anomaly Digs	August 17-21	7 Days	ML 13 Eakin to Coleville	Anomaly Digs	None	N/A	N/A	0 Dth/d	0%
August	Anomaly Digs	August 24-28	8 Days	ML 1 Eakin to Coleville	Anomaly Digs	None	N/A	N/A	0 Dth/d	0%
August	Compressor Maintenance	August 25-28	4 Days	Blind Canyon Compressor Station	Station ESD Testing	All Compression Offline	Varies, See latest EBB	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.