[2] The 2009 eruptions of Mount Redoubt renewed concerns over the safety of the nearby tank farm which holds crude oil, known as the Drift River Terminal Facility.

[4] In late March the US Coast Guard decided to move the millions of gallons located at the facility to prevent an ecological disaster.

In the meantime, oil production in Cook Inlet was suspended, because the tank farms were out of commission while Mount Redoubt remained in an eruptive state.

The AVO reported that Redoubt erupted or exhibited other notable activity at the following times, with all ash cloud heights in feet above sea level: On April 11, 2009, the Alaska Volcano Observatory released the following statement into the public domain on their USGS affiliated website regarding the aftermath of the 2009 eruptions of Mount Redoubt, and a prognosis for future activity.

A lava dome is currently growing in the summit crater, accompanied by intermittent emissions of volcanic gases and minor amounts of ash.

Plume heights, as measured by radar and confirmed by pilot reports, have exceeded 50,000 feet (15 km) above sea level on multiple occasions.

A measurement of about 1/8 inch (3 mm) following the explosion on March 26, was recorded near Silver Salmon Creek Lodge, about 30 miles (48 km) south of the volcano.

The combination of gas and ash emission from Redoubt since the beginning of the eruption has on occasion resulted in a brownish-yellow volcanic haze in the Cook Inlet region.

The volcanic haze contains small quantities of ash, water vapor, sulfur aerosols, and liquid droplets suspended in the air.

Visual and satellite observations show that by March 27, a deep crater about a half mile (800 m) across formed in the middle of the summit amphitheater, likely from one or more of the explosions during the early stage of the eruption.

By April 4, a north/south elongated lava dome, about a half mile (800 m) long had grown out of the new crater, at an elevation of around 8,000 feet (2,400 m) above sea level.

During periods between explosions, residents and pilots may also notice occasional sulfur smell and hazy conditions due to low-level ash and volcanic gas emissions.

In late May 2009, it was reported that the continued shutdown of oil production in Cook Inlet due to the eruption of Mount Redoubt was costing the state of Alaska approximately US$1.5 million a month in tax revenue.