"Boulder County commissioners oppose the construction of the Dakota Access Pipeline as a destructive and unnecessary project that continues our dependence on fossil fuels, will negatively impact natural resources and the environment, and is being forced upon people of the Standing Rock Reservation, North Dakota, South Dakota, Iowa and IL without the ability for local communities to provide meaningful input on this project".
Two pipelines in Minnesota operated by Enbridge Inc. were targeted by the environmental group, causing the company to temporarily shut down the pipelines.
"They have bulldozed over the burials of our Lakota and Dakota ancestors and have no regard for the sanctity of these places", Dave Archambault, the Standing Rock Sioux Tribe chairman, said Wednesday.
The two-page ruling issued Sunday night allows DAPL construction activity to resume in the areas within 20 miles of Lake Oahe.
Protestors object that the pipeline could harm the local water supply and disturb tribal burial sites.
In a statement, Energy Transfer Partners said they discovered an archeological site early on and adjusted the pipeline route accordingly.
Boulder County is putting its support behind the Standing Rock Sioux Tribe.
Representatives for Energy Transfer Partners and the Trump Campaign did not immediately respond to ABC News' request for further comment.
Law enforcement officials say construction has resumed on the four-state Dakota Access pipeline on private land in southern North Dakota.
The court hasn't decided on the tribe's appeal of a September ruling by U.S. District Judge James Boasberg, who declined to shut down work on the entire pipeline.
Pipeline company officials say the attempt to disrupt delivery was not successful. The "protests" are being called peaceful by gatherers., who state they're singing and dancing and not violently protesting. "You have significant risk to a vast amount of drinking water supplied to North Dakota, South Dakota, Iowa ... all the way down". The pipeline was scheduled to be in service by the end of the year, and the company hasn't said publicly that it expects that deadline to be delayed.
This item has been corrected to show that Cody Hall is a spokesman for the protest camp, not the Standing Rock Sioux tribe.
A U.S. federal court has denied a Native American tribe's appeal for an injunction to block the construction of the Dakota Access crude-oil pipeline near their reservation in the USA state of North Dakota, which they say could lead to the destruction of culturally sacred sites and contaminate their water supply.
Vicki Granado, the company's spokeswoman, declined to say exactly when construction of the $3.8bn, 2,500km pipeline - which will carry nearly half a million barrels of oil a day from North Dakota to IL - would resume.
Energy Transfer Partners still needs approval from the US Army Corps of Engineers to work on a separate parcel of federal land bordering and under Lake Oahe, which the agency manages. Green Party presidential candidate Jill Stein and running mate Ajamu Baraka both faced charges after spray-painting messages of support on construction equipment at the protest site.