Denver water has the tunnel on low flow (55cfs) for work on valves they put in this winter. The work should be done this week sometime.
Once the work on the tunnel is done, Denver water will start filling up cheeseman reservoir. Filling cheeseman means reducing cheeseman outflow and compensating by increasing the tunnel. Cheeseman outflow will likely be ~100 cfs. The tunnel should be in the 200-300 cfs range depending on water needs. It will likely take 2-4 weeks for cheeseman to fill depending on runoff.