The House-Senate conference committee has earmarked $400,000 for the project in a new appropriations bill. A vote on the bill is expected within the next several weeks.
The detox center has been a community rallying point and a campaign topic in the race for Boise mayor.
The city has already contributed more than $1 million to build the facility and budgeted $240,000 per year for annual operations. Tentative plans call for an initial 12-bed facility to be located on Allumbaugh Street, along with a "sobering station" that would be open 42 hours each week.
"The City of Boise has gone far too long without having this essential kind of facility," said Boise Mayor David Bieter in a written release.
Currently, intoxicated people are taken to hospital emergency rooms or jail to sober up. According the Mayor's Office, the city's two hospitals treat an average of 135 people per month for intoxication.