diff --git a/op-chain-ops/crossdomain/legacy_withdrawal.go b/op-chain-ops/crossdomain/legacy_withdrawal.go
index f0264090cc1c6..3f227a03f641e 100644
--- a/op-chain-ops/crossdomain/legacy_withdrawal.go
+++ b/op-chain-ops/crossdomain/legacy_withdrawal.go
@@ -14,10 +14,10 @@ import (
 
 // LegacyWithdrawal represents a pre bedrock upgrade withdrawal.
 type LegacyWithdrawal struct {
-	Target *common.Address
-	Sender *common.Address
-	Data   []byte
-	Nonce  *big.Int
+	Target *common.Address `json:"target"`
+	Sender *common.Address `json:"sender"`
+	Data   []byte          `json:"data"`
+	Nonce  *big.Int        `json:"nonce"`
 }
 
 var _ WithdrawalMessage = (*LegacyWithdrawal)(nil)
diff --git a/op-chain-ops/crossdomain/migrate.go b/op-chain-ops/crossdomain/migrate.go
new file mode 100644
index 0000000000000..1284276e7e3eb
--- /dev/null
+++ b/op-chain-ops/crossdomain/migrate.go
@@ -0,0 +1,116 @@
+package crossdomain
+
+import (
+	"errors"
+	"fmt"
+	"math/big"
+
+	"github.com/ethereum-optimism/optimism/op-bindings/bindings"
+	"github.com/ethereum-optimism/optimism/op-bindings/predeploys"
+
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/core/vm"
+)
+
+var (
+	abiTrue                      = common.Hash{31: 0x01}
+	errLegacyStorageSlotNotFound = errors.New("cannot find storage slot")
+)
+
+// MigrateWithdrawals will migrate a list of pending withdrawals given a StateDB.
+func MigrateWithdrawals(withdrawals []*PendingWithdrawal, db vm.StateDB, l1CrossDomainMessenger, l1StandardBridge *common.Address) error {
+	for _, legacy := range withdrawals {
+		legacySlot, err := legacy.StorageSlot()
+		if err != nil {
+			return err
+		}
+
+		legacyValue := db.GetState(predeploys.LegacyMessagePasserAddr, legacySlot)
+		if legacyValue != abiTrue {
+			return fmt.Errorf("%w: %s", errLegacyStorageSlotNotFound, legacyValue)
+		}
+
+		withdrawal, err := MigrateWithdrawal(&legacy.LegacyWithdrawal, l1CrossDomainMessenger, l1StandardBridge)
+		if err != nil {
+			return err
+		}
+
+		slot, err := withdrawal.StorageSlot()
+		if err != nil {
+			return err
+		}
+
+		db.SetState(predeploys.L2ToL1MessagePasserAddr, slot, abiTrue)
+	}
+	return nil
+}
+
+// MigrateWithdrawal will turn a LegacyWithdrawal into a bedrock
+// style Withdrawal.
+func MigrateWithdrawal(withdrawal *LegacyWithdrawal, l1CrossDomainMessenger, l1StandardBridge *common.Address) (*Withdrawal, error) {
+	value := new(big.Int)
+
+	isFromL2StandardBridge := *withdrawal.Sender == predeploys.L2StandardBridgeAddr
+
+	if withdrawal.Target == nil {
+		return nil, errors.New("withdrawal target cannot be nil")
+	}
+
+	isToL1StandardBridge := *withdrawal.Target == *l1StandardBridge
+
+	if isFromL2StandardBridge && isToL1StandardBridge {
+		abi, err := bindings.L1StandardBridgeMetaData.GetAbi()
+		if err != nil {
+			return nil, err
+		}
+
+		method, err := abi.MethodById(withdrawal.Data)
+		if err != nil {
+			return nil, err
+		}
+		if method.Name == "finalizeETHWithdrawal" {
+			data, err := method.Inputs.Unpack(withdrawal.Data[4:])
+			if err != nil {
+				return nil, err
+			}
+			// bounds check
+			if len(data) < 3 {
+				return nil, errors.New("not enough data")
+			}
+			var ok bool
+			value, ok = data[2].(*big.Int)
+			if !ok {
+				return nil, errors.New("not big.Int")
+			}
+		}
+	}
+
+	abi, err := bindings.L1CrossDomainMessengerMetaData.GetAbi()
+	if err != nil {
+		return nil, err
+	}
+
+	versionedNonce := EncodeVersionedNonce(withdrawal.Nonce, common.Big1)
+	data, err := abi.Pack(
+		"relayMessage",
+		versionedNonce,
+		withdrawal.Sender,
+		withdrawal.Target,
+		value,
+		new(big.Int),
+		withdrawal.Data,
+	)
+	if err != nil {
+		return nil, fmt.Errorf("cannot abi encode relayMessage: %w", err)
+	}
+
+	w := NewWithdrawal(
+		withdrawal.Nonce,
+		&predeploys.L2CrossDomainMessengerAddr,
+		l1CrossDomainMessenger,
+		value,
+		new(big.Int),
+		data,
+	)
+	return w, nil
+}
diff --git a/op-chain-ops/crossdomain/migrate_test.go b/op-chain-ops/crossdomain/migrate_test.go
new file mode 100644
index 0000000000000..9e854028c8324
--- /dev/null
+++ b/op-chain-ops/crossdomain/migrate_test.go
@@ -0,0 +1,41 @@
+package crossdomain_test
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/ethereum-optimism/optimism/op-bindings/predeploys"
+	"github.com/ethereum-optimism/optimism/op-chain-ops/crossdomain"
+	"github.com/ethereum/go-ethereum/common"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestMigrateWithdrawal(t *testing.T) {
+	withdrawals := make([]*crossdomain.LegacyWithdrawal, 0)
+
+	for _, receipt := range receipts {
+		msg, err := findCrossDomainMessage(receipt)
+		require.Nil(t, err)
+		withdrawal, err := msg.ToWithdrawal()
+		require.Nil(t, err)
+		legacyWithdrawal, ok := withdrawal.(*crossdomain.LegacyWithdrawal)
+		require.True(t, ok)
+		withdrawals = append(withdrawals, legacyWithdrawal)
+	}
+
+	l1CrossDomainMessenger := common.HexToAddress("0x25ace71c97B33Cc4729CF772ae268934F7ab5fA1")
+	l1StandardBridge := common.HexToAddress("0x99C9fc46f92E8a1c0deC1b1747d010903E884bE1")
+
+	for i, legacy := range withdrawals {
+		t.Run(fmt.Sprintf("test%d", i), func(t *testing.T) {
+			withdrawal, err := crossdomain.MigrateWithdrawal(legacy, &l1CrossDomainMessenger, &l1StandardBridge)
+			require.Nil(t, err)
+			require.NotNil(t, withdrawal)
+
+			require.Equal(t, legacy.Nonce.Uint64(), withdrawal.Nonce.Uint64())
+			require.Equal(t, *withdrawal.Sender, predeploys.L2CrossDomainMessengerAddr)
+			require.Equal(t, *withdrawal.Target, l1CrossDomainMessenger)
+		})
+	}
+}
diff --git a/op-chain-ops/crossdomain/withdrawal.go b/op-chain-ops/crossdomain/withdrawal.go
index a3d20ec725cd3..521ed561e5994 100644
--- a/op-chain-ops/crossdomain/withdrawal.go
+++ b/op-chain-ops/crossdomain/withdrawal.go
@@ -13,12 +13,12 @@ var _ WithdrawalMessage = (*Withdrawal)(nil)
 
 // Withdrawal represents a withdrawal transaction on L2
 type Withdrawal struct {
-	Nonce    *big.Int
-	Sender   *common.Address
-	Target   *common.Address
-	Value    *big.Int
-	GasLimit *big.Int
-	Data     []byte
+	Nonce    *big.Int        `json:"nonce"`
+	Sender   *common.Address `json:"sender"`
+	Target   *common.Address `json:"target"`
+	Value    *big.Int        `json:"value"`
+	GasLimit *big.Int        `json:"gasLimit"`
+	Data     []byte          `json:"data"`
 }
 
 // NewWithdrawal will create a Withdrawal
diff --git a/op-chain-ops/crossdomain/withdrawals.go b/op-chain-ops/crossdomain/withdrawals.go
index fbbd059907ef1..49eddfeba9880 100644
--- a/op-chain-ops/crossdomain/withdrawals.go
+++ b/op-chain-ops/crossdomain/withdrawals.go
@@ -15,12 +15,8 @@ import (
 // A PendingWithdrawal represents a withdrawal that has
 // not been finalized on L1
 type PendingWithdrawal struct {
-	Target          common.Address `json:"target"`
-	Sender          common.Address `json:"sender"`
-	Message         []byte         `json:"message"`
-	MessageNonce    *big.Int       `json:"nonce"`
-	GasLimit        *big.Int       `json:"gasLimit"`
-	TransactionHash common.Hash    `json:"transactionHash"`
+	LegacyWithdrawal `json:"withdrawal"`
+	TransactionHash  common.Hash `json:"transactionHash"`
 }
 
 // Backends represents a set of backends for L1 and L2.
@@ -119,11 +115,12 @@ func GetPendingWithdrawals(messengers *Messengers, version *big.Int, start, end
 			log.Info("%s not yet relayed", event.Raw.TxHash)
 
 			withdrawal := PendingWithdrawal{
-				Target:          event.Target,
-				Sender:          event.Sender,
-				Message:         event.Message,
-				MessageNonce:    event.MessageNonce,
-				GasLimit:        event.GasLimit,
+				LegacyWithdrawal: LegacyWithdrawal{
+					Target: &event.Target,
+					Sender: &event.Sender,
+					Data:   event.Message,
+					Nonce:  event.MessageNonce,
+				},
 				TransactionHash: event.Raw.TxHash,
 			}
 
diff --git a/op-chain-ops/crossdomain/withdrawals_test.go b/op-chain-ops/crossdomain/withdrawals_test.go
index 30cc34335d9e9..287ce52145a31 100644
--- a/op-chain-ops/crossdomain/withdrawals_test.go
+++ b/op-chain-ops/crossdomain/withdrawals_test.go
@@ -272,8 +272,7 @@ func TestGetPendingWithdrawals(t *testing.T) {
 	for i, msg := range msgs[3:] {
 		withdrawal := withdrawals[i]
 
-		require.Equal(t, msg.Target, withdrawal.Target)
-		require.Equal(t, msg.Message, withdrawal.Message)
-		require.Equal(t, uint64(msg.MinGasLimit), withdrawal.GasLimit.Uint64())
+		require.Equal(t, msg.Target, *withdrawal.Target)
+		require.Equal(t, msg.Message, withdrawal.Data)
 	}
 }