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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 % |
|---|---|---|---|---|---|---|---|---|---|---|
| April - May | Anomaly Digs | April 6 - May 9 | 34 days | JL46/JL47 | Anomaly Digs | Reduced Flows on JL46 Myton and JL47 Myton Segments | JL46 Myton: 66,200 Dth/d JL47 Myton: 77,700 Dth/d |
TBD | TBD | TBD |
| 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 14 April 27- May 1 |
1 Day 5 Days |
Simon Compressor Station | Station ESD Testing | For Simon outages, the flow will be limited to 84% of normal capacity. This assumes an average day time temperature of 80 F. | JL 65: 25,500 Dth/d ML 26: 7,750 Dth/d ML 23 : 30,250 Dth/d MAP 967: 45,850 |
Nightingale ML22: 175,000 Dth/d JL 65: 21,700 Dth/d ML 26: 6,600 Dth/d ML 23 : 25,800 Dth/d MAP 967: 38,490 |
TBD | TBD |
May |
Pig |
May 5 - 6 |
2 Days |
ML 2 Coalville to Little Mountain | Smart Tool |
None | N/A | N/A | 0 Dth/d | 0% |
May |
Pig |
May 7 |
1 Day |
ML 14 Coalville to Little Mountain | Smart Tool |
None | N/A | N/A | 0 Dth/d | 0% |
| 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 |
Pig |
May 14 |
1 Day |
ML 13 Nightingale to Eakin | Smart Tool |
MAP 293 @70,000 Dth/d | MAP 293: 172,500 Dth/d | MAP 293: 70,000 Dth/d | TBD | TBD |
May |
Pig |
May 19 |
1 Day |
ML 13 Nightingale to Eakin | Smart Tool |
MAP 293 @70,000 Dth/d |
MAP 293: 172,500 Dth/d |
MAP 293: 70,000 Dth/d | 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 | June 1- 10 | 10 Days | ML48/ML60 Junction | Anomaly Digs | Lower Operating Pressures | N/A | N/A | 0 Dth/d | 0% |
| June | Pig |
June 2 |
1 Day |
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 - 18 |
3 Days |
ML 2 Coalville to Little Mountain | Smart Tool |
None | N/A | N/A | 0 Dth/d | 0% |
| June | Pig |
June 24 |
1 Day |
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 |
1 Day |
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 @70,000 Dth/d |
MAP 293: 172,500 Dth/d |
MAP 293: 70,000 Dth/d |
TBD | TBD |
| August | Anomaly Digs | Aug 3- 15 | 13 | ML22 and ML23 Skull Creek Compressor | Anomaly Digs | Capacity reduction on ML22 Nightengale segment, reduced pressures. | Varies, See latest EBB | TBD | TBD | TBD |
| August | Pig |
August 6 |
1 Day |
ML 1 Nightingale to Eakin | Smart Tool |
MAP 293 @70,000 Dth/d | MAP 293: 172,500 Dth/d |
MAP 293: 70,000 Dth/d | 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.