Narrative:

We were approaching fulla passing through 18;500 feet descending via the ANCHR3 STAR in managed/managed on the MCP. All speed restrictions were deleted and we were assigned 280 KIAS. The FMS was programmed to reflect the clearance with a bottom altitude of 11;000 feet. We were expecting and had briefed the ILS 35L. Conditions at den had been varying between 3 NM to 5 NM visibility; -fzdzsn and 400 broken with 800 ovc to 400 ovc.the ATIS for den began updating rapidly as conditions suddenly began deteriorating. An ATIS indicating -5C ¼ NM -fzdzsn bcfg 400VV came up; an ATC speed reduction to 250 KIAS and a runway change to ILS 35R came in rapid succession.I selected speed 250 KIAS and 1/2 speed brakes to slow. I then selected V/south to match the descent rate of the current profile to keep the autopilot from pitching up to slow thereby busting the top altitude of 15;000 feet at fulla. We reprogrammed the FMS for an ILS 35R and got the QRH out to the review a CAT III approach. We also pulled landing data for 35R to review potential braking action effects combined with an auto land on landing distance.as the sudden flurry of activity slowed in the cockpit; I realized we were just leveling at 11;000 feet; but we had not reached fulla yet which has a block altitude of 13;000-15;000 feet.we informed ATC of the deviation and were instructed to comply with the remaining restrictions on the STAR. No loss of separation occurred with any other aircraft. The rest of the flight was completed without further issues.

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Original NASA ASRS Text

Title: Air carrier Captain on STAR with a runway change overshoots crossing altitude at intersection.

Narrative: We were approaching FULLA passing through 18;500 feet descending via the ANCHR3 STAR in MANAGED/MANAGED on the MCP. All speed restrictions were deleted and we were assigned 280 KIAS. The FMS was programmed to reflect the clearance with a bottom altitude of 11;000 feet. We were expecting and had briefed the ILS 35L. Conditions at DEN had been varying between 3 NM to 5 NM visibility; -FZDZSN and 400 BKN with 800 OVC to 400 OVC.The ATIS for DEN began updating rapidly as conditions suddenly began deteriorating. An ATIS indicating -5C ¼ NM -FZDZSN BCFG 400VV came up; an ATC speed reduction to 250 KIAS and a runway change to ILS 35R came in rapid succession.I selected speed 250 KIAS and 1/2 speed brakes to slow. I then selected V/S to match the descent rate of the current profile to keep the autopilot from pitching up to slow thereby busting the top altitude of 15;000 feet at FULLA. We reprogrammed the FMS for an ILS 35R and got the QRH out to the review a CAT III approach. We also pulled landing data for 35R to review potential braking action effects combined with an auto land on landing distance.As the sudden flurry of activity slowed in the cockpit; I realized we were just leveling at 11;000 feet; but we had not reached FULLA yet which has a block altitude of 13;000-15;000 feet.We informed ATC of the deviation and were instructed to comply with the remaining restrictions on the STAR. No loss of separation occurred with any other aircraft. The rest of the flight was completed without further issues.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.