diff --git a/src/scripts/saveForkDeployment.js b/src/scripts/saveForkDeployment.js
new file mode 100644
index 0000000..ceae7cf
--- /dev/null
+++ b/src/scripts/saveForkDeployment.js
@@ -0,0 +1,119 @@
+/* eslint-disable import/no-dynamic-require, global-require */
+/* eslint-disable no-console, no-inner-declarations, no-undef, import/no-unresolved, no-restricted-syntax */
+const path = require('path');
+const fs = require('fs');
+const { ethers } = require('hardhat');
+require('dotenv').config({ path: path.resolve(__dirname, '../.env') });
+const common = require('../common/common');
+const FILTER_RANGE = 1000;
+
+async function main() {
+
+    const args = process.argv.slice(2);
+    const deploymentName = args[0];
+    const whichFork = parseInt(args[1]);
+
+    if (whichFork !== 1 && whichFork !== 2) {
+        throw new Error("Usage: node saveForkDeployment.js <old_deployment> <1_or_2> [<fork_block_number]> [<new_name>]");
+    }
+
+    // Optionally we can specify the block number to avoid a slow log lookup
+    // If you pass nothing or "0" we will try to fetch it automatically
+    let forkBlockNumber = args.length >= 3 ? parseInt(args[2]) : 0;
+
+    // Optionally you can pass in the name of the new chain, otherwise we'll add _1 or _2 to the old chain
+    const newDeploymentName = args.length >= 4 ? args[3] : deploymentName + "_" + whichFork;
+
+    const deploymentOutput = require(`../../deployments/${deploymentName}/deploy_output.json`);
+    const deployParameters = require(`../../deployments/${deploymentName}/deploy_parameters.json`);
+
+    const oldDeploymentPath = path.resolve(__dirname, `../../deployments/${deploymentName}`);
+    const newDeploymentPath = path.resolve(__dirname, `../../deployments/${newDeploymentName}`);
+
+    if (fs.existsSync(newDeploymentPath)) {
+        throw new Error("New deployment directory already exists. Delete it to create it fresh. "+newDeploymentPath);
+    }
+
+    const currentProvider = await common.loadProvider(deployParameters, process.env);
+    const deployer = await common.loadDeployer(currentProvider, deployParameters);
+
+    const parentForkingManagerAddress = deploymentOutput['forkingManager'];
+    console.log('looking up children of', parentForkingManagerAddress);
+
+    const parentForkingManager = (await ethers.getContractAt(
+        'contracts/ForkingManager.sol:ForkingManager',
+        parentForkingManagerAddress,
+    )).connect(deployer);
+
+    const parentZkEVMAddress = await parentForkingManager.zkEVM();
+    const parentZkEVM = (await ethers.getContractAt(
+        'contracts/ForkableZkEVM.sol:ForkableZkEVM',
+        parentZkEVMAddress,
+    )).connect(deployer);
+
+    const children = await parentForkingManager.getChildren();
+    const forkingManagerAddress = children[whichFork-1];
+
+    const forkingManager = (await ethers.getContractAt(
+        'contracts/ForkingManager.sol:ForkingManager',
+        forkingManagerAddress,
+    )).connect(deployer);
+
+    const polygonZkEVMAddress = await forkingManager.zkEVM();
+    const zkevm = (await ethers.getContractAt(
+        'contracts/ForkableZkEVM.sol:ForkableZkEVM',
+        polygonZkEVMAddress,
+    )).connect(deployer);
+
+    deployParameters.chainID = (await zkevm.chainID()).toNumber();
+    deploymentOutput.chainID = deployParameters.chainID; // TODO: This should probably only appear in one
+    deployParameters.arbitrationFee = (await forkingManager.arbitrationFee()).toString();
+
+    deploymentOutput.polygonZkEVMAddress = polygonZkEVMAddress;
+
+    deploymentOutput.polygonZkEVMBridgeAddress = await forkingManager.bridge();
+    deploymentOutput.polygonZkEVMGlobalExitRootAddress = await forkingManager.globalExitRoot();
+    deploymentOutput.forkingManager = forkingManagerAddress;
+    deploymentOutput.maticTokenAddress = forkingManager.forkonomicToken();
+
+    const lastVerifiedBatch = parentZkEVM.lastVerifiedBatch();
+    deploymentOutput.genesisRoot = parentZkEVM.batchNumToStateRoot(lastVerifiedBatch);
+
+    let endBlock = await ethers.provider.getBlockNumber()
+    const initializedFilter = forkingManager.filters.Initialized();
+    if (forkBlockNumber == 0) {
+        console.log('Searching back through logs for the fork block number. If this takes too long you may prefer to pass it manually.');
+        while(true) {
+            let startBlock = endBlock - FILTER_RANGE;
+            if (startBlock < 0) {
+                startBlock = 0;
+            }
+            // console.log('searching log range', startBlock, endBlock);
+            const pastEvents = await forkingManager.queryFilter(initializedFilter, startBlock, endBlock);
+            if (pastEvents.length > 0) {
+                forkBlockNumber = pastEvents[0].blockNumber;
+                console.log('Found fork block number at', forkBlockNumber);
+                break;
+            }
+            if (startBlock == 0) {
+                console.log('Fork block not found, you may be able to set it manually.');
+                break;
+            }
+            endBlock = startBlock - 1;
+        }
+    }
+
+    deploymentOutput.deploymentBlockNumber = forkBlockNumber;
+
+    console.log('Saving new deployment at', newDeploymentPath);
+    fs.cpSync(oldDeploymentPath, newDeploymentPath, {recursive: true});
+
+    fs.writeFileSync(newDeploymentPath+'/deploy_output.json', JSON.stringify(deploymentOutput, null, 1));
+    fs.writeFileSync(newDeploymentPath+'/deploy_parameters.json', JSON.stringify(deployParameters, null, 1));
+
+}
+
+main().catch((e) => {
+    console.error(e);
+    process.exit(1);
+});
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