Skip to main content

An oil spill near Little Buffalo, Alta., is the latest in a series of such incidents in North America over the past year, raising questions about the safety of the continent's pipeline network and the adequacy of its regulatory system.

Open this photo in gallery:

Crews work to clean up oil at a beaver dam from a pipeline spill, owned by Plains Midstream Canada, 12kms from Little Buffalo 100kms from Peace River in northern Alberta on May 10, 2011. The 4.5 million litre spill is the largest in Alberta since 1975.

1 of 12
Open this photo in gallery:

The site of the damaged pipeline, is now repaired and replaced with new pipeline. Crews work to clean up oil at a beaver dam from a pipeline spill, owned by Plains Midstream Canada, 12kms from Little Buffalo 100kms from Peace River in northern Alberta on May 10, 2011. The 4.5 million litre spill is the largest in Alberta since 1975.

2 of 12
Open this photo in gallery:

Lillian Whitehead, who teaches Cree at the Little Buffalo school, stands in her classroom on May 10, 2011. It was the first day of school since closure due to an oil pipeline spill. Crews from Plains Midstream Pipeline have been trying to clean up oil at a beaver dam from their pipeline spill 12kms from Little Buffalo. Little Buffalo is 100kms from Peace River in northern Alberta. The 4.5 million litre spill is the largest in Alberta since 1975.

3 of 12
Open this photo in gallery:

Lillian Whitehead, who teaches Cree at the Little Buffalo school, stands in her classroom on May 10, 2011. It was the first day of school since closure due to an oil pipeline spill. Crews from Plains Midstream Pipeline have been trying to clean up oil at a beaver dam from their pipeline spill 12kms from Little Buffalo. Little Buffalo is 100kms from Peace River in northern Alberta. The 4.5 million litre spill is the largest in Alberta since 1975.

4 of 12
Open this photo in gallery:

Crews work to clean up oil at a beaver dam from a pipeline spill, owned by Plains Midstream Canada, 12kms from Little Buffalo 100kms from Peace River in northern Alberta on May 10, 2011. The 4.5 million litre spill is the largest in Alberta since 1975.

5 of 12
Open this photo in gallery:

A 1.7 km wood road was built to a site where crews work to clean up oil at a beaver dam from a pipeline spill, owned by Plains Midstream Canada, 12kms from Little Buffalo 100kms from Peace River in northern Alberta on May 10, 2011. The 4.5 million litre spill is the largest in Alberta since 1975.

6 of 12
Open this photo in gallery:

A plug in the pipeline to block both sides of the damaged pipeline. Crews work to clean up oil at a beaver dam from a pipeline spill, owned by Plains Midstream Canada, 12kms from Little Buffalo 100kms from Peace River in northern Alberta on May 10, 2011. The 4.5 million litre spill is the largest in Alberta since 1975.

7 of 12
Open this photo in gallery:

The site of the damaged pipeline, is now repaired and replaced with new pipeline. Crews work to clean up oil at a beaver dam from a pipeline spill, owned by Plains Midstream Canada, 12kms from Little Buffalo 100kms from Peace River in northern Alberta on May 10, 2011. The 4.5 million litre spill is the largest in Alberta since 1975.

8 of 12
Open this photo in gallery:

The site of the damaged pipeline, is now repaired and replaced with new pipeline. Crews work to clean up oil at a beaver dam from a pipeline spill, owned by Plains Midstream Canada, 12kms from Little Buffalo 100kms from Peace River in northern Alberta on May 10, 2011. The 4.5 million litre spill is the largest in Alberta since 1975.

9 of 12
Open this photo in gallery:

Crews work to clean up oil at a beaver dam from a pipeline spill, owned by Plains Midstream Canada, 12kms from Little Buffalo 100kms from Peace River in northern Alberta on May 10, 2011. The 4.5 million litre spill is the largest in Alberta since 1975.

10 of 12
Open this photo in gallery:

Crews work to clean up oil at a beaver dam from a pipeline spill, owned by Plains Midstream Canada, 12kms from Little Buffalo 100kms from Peace River in northern Alberta on May 10, 2011. The 4.5 million litre spill is the largest in Alberta since 1975.

11 of 12
Open this photo in gallery:

Crews work to clean up oil at a beaver dam from a pipeline spill, owned by Plains Midstream Canada, 12kms from Little Buffalo 100kms from Peace River in northern Alberta on May 10, 2011. The 4.5 million litre spill is the largest in Alberta since 1975.

12 of 12

Interact with The Globe