01Educate
Train before the emergency.
We run workshops and field exercises so residents, ham operators, and agency staff know how to use the network when it matters — not for the first time during a disaster.
S.I.E.R.R.ASignal Integrity & Emergency Radio Response Alliance
When the grid goes dark,the signal stays up.
We build, operate, and train the volunteers behind an off-grid emergency communications network for the Calaveras & Tuolumne foothills.
- Network HQ
- Coverage town
- Regional hub
Real-time Operational StatusSynced 20:08 PT
Mission
Resilience is built before the disaster.
S.I.E.R.R.A — the Signal Integrity & Emergency Radio Response Alliance — is a volunteer non-profit that builds and operates off-grid emergency communication infrastructure across the Calaveras and Tuolumne foothills, and trains the people who keep it running. When wildfire, storm, or blackout takes the grid down, our LoRa mesh and amateur-radio network keeps neighbors, first responders, and emergency managers connected.
Operational Doctrine
How the network stays ready.
02Build
Infrastructure that outlasts the grid.
We deploy and maintain solar-powered LoRa relays and repeater sites along the Highway 4 and Highway 49 corridors, engineered to keep passing messages when power and cell service are gone.
03Operate
A standing capability, not an afterthought.
Trained volunteers monitor conditions, relay traffic, and coordinate with fire districts and county emergency management — so the communications backbone is ready the moment it is needed.