CHICAGO, Jan 23 (Reuters) - Spot basis bids for soybeans fell at river terminals and other facilities in the U.S. Midwest on Thursday as demand for supplies eased following selling by farmers, traders said.

* The corn basis was mixed to steady.

* Chicago Board of Trade soybean futures Sv1 reached their highest level since July on Wednesday, while corn futures Cv1 hit a December 2023 high on Thursday.

* Rising prices have encouraged farmer selling.

* Soybean basis bids declined by 5 cents each at river terminals in Seneca, Illinois and near Davenport, Iowa.

* At a processor in Lincoln, Nebraska, the soybean basis fell by 10 cents a bushel after a 5-cent drop there on Wednesday.

Basis values are quoted against CBOT futures in cts/bu:

NOTE: 0 = Option price, UNC = Unchanged, UNQ = Unquoted

NC = Not comparable, DP = Delayed price, N/A = Not available,

F = January, H = March, K = May, N = JulyQ = August, U = September, X = November, Z = December

--------------------------------------------------------

LINKS: 0#USCSHGRN-PM

For U.S. forward basis spreadsheets, please click:

CORN/BASIS, SOYA/BASIS, WHEAT/BASIS, MILO/BASIS

- CBOT corn report COR/

- CBOT soybean report SOY/C

- CBOT wheat report WHE/C

- U.S. grain barge freight values BG/US

- U.S. Midwest cash grain PM GRA/PM

- U.S. CIF/FOB Gulf Grain GRA/F

(Reporting by Tom Polansek; Editing by Rod Nickel)

((Thomas.Polansek@thomsonreuters.com))